x=3(-4)-x

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Solution for x=3(-4)-x equation: 


Simplifying
x = 3(-4) + -1x

Multiply 3 * -4
x = -12 + -1x

Solving
x = -12 + -1x

Solving for variable 'x'.

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

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

Combine like terms: x + x = 2x
2x = -12 + -1x + x

Combine like terms: -1x + x = 0
2x = -12 + 0
2x = -12

Divide each side by '2'.
x = -6

Simplifying
x = -6

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