(x+7)(x-3)=(2x+1)(x-3)

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Solution for (x+7)(x-3)=(2x+1)(x-3) equation:


Simplifying
(x + 7)(x + -3) = (2x + 1)(x + -3)

Reorder the terms:
(7 + x)(x + -3) = (2x + 1)(x + -3)

Reorder the terms:
(7 + x)(-3 + x) = (2x + 1)(x + -3)

Multiply (7 + x) * (-3 + x)
(7(-3 + x) + x(-3 + x)) = (2x + 1)(x + -3)
((-3 * 7 + x * 7) + x(-3 + x)) = (2x + 1)(x + -3)
((-21 + 7x) + x(-3 + x)) = (2x + 1)(x + -3)
(-21 + 7x + (-3 * x + x * x)) = (2x + 1)(x + -3)
(-21 + 7x + (-3x + x2)) = (2x + 1)(x + -3)

Combine like terms: 7x + -3x = 4x
(-21 + 4x + x2) = (2x + 1)(x + -3)

Reorder the terms:
-21 + 4x + x2 = (1 + 2x)(x + -3)

Reorder the terms:
-21 + 4x + x2 = (1 + 2x)(-3 + x)

Multiply (1 + 2x) * (-3 + x)
-21 + 4x + x2 = (1(-3 + x) + 2x * (-3 + x))
-21 + 4x + x2 = ((-3 * 1 + x * 1) + 2x * (-3 + x))
-21 + 4x + x2 = ((-3 + 1x) + 2x * (-3 + x))
-21 + 4x + x2 = (-3 + 1x + (-3 * 2x + x * 2x))
-21 + 4x + x2 = (-3 + 1x + (-6x + 2x2))

Combine like terms: 1x + -6x = -5x
-21 + 4x + x2 = (-3 + -5x + 2x2)

Solving
-21 + 4x + x2 = -3 + -5x + 2x2

Solving for variable 'x'.

Reorder the terms:
-21 + 3 + 4x + 5x + x2 + -2x2 = -3 + -5x + 2x2 + 3 + 5x + -2x2

Combine like terms: -21 + 3 = -18
-18 + 4x + 5x + x2 + -2x2 = -3 + -5x + 2x2 + 3 + 5x + -2x2

Combine like terms: 4x + 5x = 9x
-18 + 9x + x2 + -2x2 = -3 + -5x + 2x2 + 3 + 5x + -2x2

Combine like terms: x2 + -2x2 = -1x2
-18 + 9x + -1x2 = -3 + -5x + 2x2 + 3 + 5x + -2x2

Reorder the terms:
-18 + 9x + -1x2 = -3 + 3 + -5x + 5x + 2x2 + -2x2

Combine like terms: -3 + 3 = 0
-18 + 9x + -1x2 = 0 + -5x + 5x + 2x2 + -2x2
-18 + 9x + -1x2 = -5x + 5x + 2x2 + -2x2

Combine like terms: -5x + 5x = 0
-18 + 9x + -1x2 = 0 + 2x2 + -2x2
-18 + 9x + -1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-18 + 9x + -1x2 = 0

Factor a trinomial.
(-6 + x)(3 + -1x) = 0

Subproblem 1

Set the factor '(-6 + x)' equal to zero and attempt to solve: Simplifying -6 + x = 0 Solving -6 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 0 + 6 Combine like terms: -6 + 6 = 0 0 + x = 0 + 6 x = 0 + 6 Combine like terms: 0 + 6 = 6 x = 6 Simplifying x = 6

Subproblem 2

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {6, 3}

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