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-40+2n=4n-8n-64
We move all terms to the left:
-40+2n-(4n-8n-64)=0
We add all the numbers together, and all the variables
2n-(-4n-64)-40=0
We get rid of parentheses
2n+4n+64-40=0
We add all the numbers together, and all the variables
6n+24=0
We move all terms containing n to the left, all other terms to the right
6n=-24
n=-24/6
n=-4
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