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3(n+4)=-15=0
We move all terms to the left:
3(n+4)-(-15)=0
We add all the numbers together, and all the variables
3(n+4)+15=0
We multiply parentheses
3n+12+15=0
We add all the numbers together, and all the variables
3n+27=0
We move all terms containing n to the left, all other terms to the right
3n=-27
n=-27/3
n=-9
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