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-3n+4(3n+15)=-21
We move all terms to the left:
-3n+4(3n+15)-(-21)=0
We add all the numbers together, and all the variables
-3n+4(3n+15)+21=0
We multiply parentheses
-3n+12n+60+21=0
We add all the numbers together, and all the variables
9n+81=0
We move all terms containing n to the left, all other terms to the right
9n=-81
n=-81/9
n=-9
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