(x-5)(x+3)=21-7x

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Solution for (x-5)(x+3)=21-7x equation: 


Simplifying
(x + -5)(x + 3) = 21 + -7x

Reorder the terms:
(-5 + x)(x + 3) = 21 + -7x

Reorder the terms:
(-5 + x)(3 + x) = 21 + -7x

Multiply (-5 + x) * (3 + x)
(-5(3 + x) + x(3 + x)) = 21 + -7x
((3 * -5 + x * -5) + x(3 + x)) = 21 + -7x
((-15 + -5x) + x(3 + x)) = 21 + -7x
(-15 + -5x + (3 * x + x * x)) = 21 + -7x
(-15 + -5x + (3x + x2)) = 21 + -7x

Combine like terms: -5x + 3x = -2x
(-15 + -2x + x2) = 21 + -7x

Solving
-15 + -2x + x2 = 21 + -7x

Solving for variable 'x'.

Reorder the terms:
-15 + -21 + -2x + 7x + x2 = 21 + -7x + -21 + 7x

Combine like terms: -15 + -21 = -36
-36 + -2x + 7x + x2 = 21 + -7x + -21 + 7x

Combine like terms: -2x + 7x = 5x
-36 + 5x + x2 = 21 + -7x + -21 + 7x

Reorder the terms:
-36 + 5x + x2 = 21 + -21 + -7x + 7x

Combine like terms: 21 + -21 = 0
-36 + 5x + x2 = 0 + -7x + 7x
-36 + 5x + x2 = -7x + 7x

Combine like terms: -7x + 7x = 0
-36 + 5x + x2 = 0

Factor a trinomial.
(-9 + -1x)(4 + -1x) = 0


Subproblem 1
Set the factor '(-9 + -1x)' equal to zero and attempt to solve:

Simplifying
-9 + -1x = 0

Solving
-9 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + -1x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1x = 0 + 9
-1x = 0 + 9

Combine like terms: 0 + 9 = 9
-1x = 9

Divide each side by '-1'.
x = -9

Simplifying
x = -9

Subproblem 2
Set the factor '(4 + -1x)' equal to zero and attempt to solve:

Simplifying
4 + -1x = 0

Solving
4 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-4' to each side of the equation.
4 + -4 + -1x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1x = 0 + -4
-1x = 0 + -4

Combine like terms: 0 + -4 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4
Solution
x = {-9, 4}

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