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-6n-6(2n-3)=90
We move all terms to the left:
-6n-6(2n-3)-(90)=0
We multiply parentheses
-6n-12n+18-90=0
We add all the numbers together, and all the variables
-18n-72=0
We move all terms containing n to the left, all other terms to the right
-18n=72
n=72/-18
n=-4
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