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6(1+2n)=-90
We simplify the equation to the form, which is simple to understand
6(1+2n)=-90
Reorder the terms in parentheses
+(+6+12n)=-90
Remove unnecessary parentheses
+6+12n=-90
We move all terms containing n to the left and all other terms to the right.
+12n=-90-6
We simplify left and right side of the equation.
+12n=-96
We divide both sides of the equation by 12 to get n.
n=-8
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