x*x-9=x*x-2x

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Solution for x*x-9=x*x-2x equation:


Simplifying
x * x + -9 = x * x + -2x

Multiply x * x
x2 + -9 = x * x + -2x

Reorder the terms:
-9 + x2 = x * x + -2x

Multiply x * x
-9 + x2 = x2 + -2x

Reorder the terms:
-9 + x2 = -2x + x2

Add '-1x2' to each side of the equation.
-9 + x2 + -1x2 = -2x + x2 + -1x2

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

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

Solving
-9 = -2x

Solving for variable 'x'.

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

Add '2x' to each side of the equation.
-9 + 2x = -2x + 2x

Combine like terms: -2x + 2x = 0
-9 + 2x = 0

Add '9' to each side of the equation.
-9 + 9 + 2x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 2x = 0 + 9
2x = 0 + 9

Combine like terms: 0 + 9 = 9
2x = 9

Divide each side by '2'.
x = 4.5

Simplifying
x = 4.5

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