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3(n-1)=-12
We simplify the equation to the form, which is simple to understand
3(n-1)=-12
Reorder the terms in parentheses
+(+3n-3)=-12
Remove unnecessary parentheses
+3n-3=-12
We move all terms containing n to the left and all other terms to the right.
+3n=-12+3
We simplify left and right side of the equation.
+3n=-9
We divide both sides of the equation by 3 to get n.
n=-3
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