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3(n+-5)=-21
We move all terms to the left:
3(n+-5)-(-21)=0
We add all the numbers together, and all the variables
3(n-5)-(-21)=0
We add all the numbers together, and all the variables
3(n-5)+21=0
We multiply parentheses
3n-15+21=0
We add all the numbers together, and all the variables
3n+6=0
We move all terms containing n to the left, all other terms to the right
3n=-6
n=-6/3
n=-2
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