3(-x)-x=12

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Solution for 3(-x)-x=12 equation:


3(-x)-x=12

We simplify the equation to the form, which is simple to understand 
3(-x)-x=12

Reorder the terms in parentheses
+(-3x)-x=12

Remove unnecessary parentheses
-3x-x=+12

We move all terms containing x to the left and all other terms to the right. 
-3x-1x=+12

We simplify left and right side of the equation. 
-4x=+12

We divide both sides of the equation by -4 to get x. 
x=-3

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