(x+7)(x+3)=x(x+20)+1

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Solution for (x+7)(x+3)=x(x+20)+1 equation:


Simplifying
(x + 7)(x + 3) = x(x + 20) + 1

Reorder the terms:
(7 + x)(x + 3) = x(x + 20) + 1

Reorder the terms:
(7 + x)(3 + x) = x(x + 20) + 1

Multiply (7 + x) * (3 + x)
(7(3 + x) + x(3 + x)) = x(x + 20) + 1
((3 * 7 + x * 7) + x(3 + x)) = x(x + 20) + 1
((21 + 7x) + x(3 + x)) = x(x + 20) + 1
(21 + 7x + (3 * x + x * x)) = x(x + 20) + 1
(21 + 7x + (3x + x2)) = x(x + 20) + 1

Combine like terms: 7x + 3x = 10x
(21 + 10x + x2) = x(x + 20) + 1

Reorder the terms:
21 + 10x + x2 = x(20 + x) + 1
21 + 10x + x2 = (20 * x + x * x) + 1
21 + 10x + x2 = (20x + x2) + 1

Reorder the terms:
21 + 10x + x2 = 1 + 20x + x2

Add '-1x2' to each side of the equation.
21 + 10x + x2 + -1x2 = 1 + 20x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
21 + 10x + 0 = 1 + 20x + x2 + -1x2
21 + 10x = 1 + 20x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
21 + 10x = 1 + 20x + 0
21 + 10x = 1 + 20x

Solving
21 + 10x = 1 + 20x

Solving for variable 'x'.

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

Add '-20x' to each side of the equation.
21 + 10x + -20x = 1 + 20x + -20x

Combine like terms: 10x + -20x = -10x
21 + -10x = 1 + 20x + -20x

Combine like terms: 20x + -20x = 0
21 + -10x = 1 + 0
21 + -10x = 1

Add '-21' to each side of the equation.
21 + -21 + -10x = 1 + -21

Combine like terms: 21 + -21 = 0
0 + -10x = 1 + -21
-10x = 1 + -21

Combine like terms: 1 + -21 = -20
-10x = -20

Divide each side by '-10'.
x = 2

Simplifying
x = 2

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