(5+x)*(x-3)=x*x

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


Simplifying
(5 + x)(x + -3) = x * x

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

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

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

Multiply x * x
-15 + 2x + x2 = x2

Add '-1x2' to each side of the equation.
-15 + 2x + x2 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-15 + 2x + 0 = x2 + -1x2
-15 + 2x = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-15 + 2x = 0

Solving
-15 + 2x = 0

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + 2x = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 2x = 0 + 15
2x = 0 + 15

Combine like terms: 0 + 15 = 15
2x = 15

Divide each side by '2'.
x = 7.5

Simplifying
x = 7.5

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