x^2+x-(-2x)=x^2+12

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Solution for x^2+x-(-2x)=x^2+12 equation: 


Simplifying
x2 + x + -1(-2x) = x2 + 12

Remove parenthesis around (-2x)
x2 + x + -1 * -2x = x2 + 12

Multiply -1 * -2
x2 + x + 2x = x2 + 12

Reorder the terms:
x + 2x + x2 = x2 + 12

Combine like terms: x + 2x = 3x
3x + x2 = x2 + 12

Reorder the terms:
3x + x2 = 12 + x2

Add '-1x2' to each side of the equation.
3x + x2 + -1x2 = 12 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
3x + 0 = 12 + x2 + -1x2
3x = 12 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
3x = 12 + 0
3x = 12

Solving
3x = 12

Solving for variable 'x'.

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

Divide each side by '3'.
x = 4

Simplifying
x = 4

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