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-3(5n+5)=90
We simplify the equation to the form, which is simple to understand
-3(5n+5)=90
Reorder the terms in parentheses
+(-15n-15)=90
Remove unnecessary parentheses
-15n-15=+90
We move all terms containing n to the left and all other terms to the right.
-15n=+90+15
We simplify left and right side of the equation.
-15n=+105
We divide both sides of the equation by -15 to get n.
n=-7
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