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12(x+3)=-(x+3)
We simplify the equation to the form, which is simple to understand
12(x+3)=-(x+3)
Reorder the terms in parentheses
+(+12x+36)=-(x+3)
Remove unnecessary parentheses
+12x+36=-(+x+3+)
Remove unnecessary parentheses
+12x+36=-1x-3
We move all terms containing x to the left and all other terms to the right.
+12x+1x=-3-36
We simplify left and right side of the equation.
+13x=-39
We divide both sides of the equation by 13 to get x.
x=-3
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