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-4(n-7)=64
We move all terms to the left:
-4(n-7)-(64)=0
We multiply parentheses
-4n+28-64=0
We add all the numbers together, and all the variables
-4n-36=0
We move all terms containing n to the left, all other terms to the right
-4n=36
n=36/-4
n=-9
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