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-3x -3(x+12)=-162
We simplify the equation to the form, which is simple to understand
-3x-3(x+12)=-162
Reorder the terms in parentheses
-3x+(-3x-36)=-162
Remove unnecessary parentheses
-3x-3x-36=-162
We move all terms containing x to the left and all other terms to the right.
-3x-3x=-162+36
We simplify left and right side of the equation.
-6x=-126
We divide both sides of the equation by -6 to get x.
x=21
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