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-2(n-87)=-20
We move all terms to the left:
-2(n-87)-(-20)=0
We add all the numbers together, and all the variables
-2(n-87)+20=0
We multiply parentheses
-2n+174+20=0
We add all the numbers together, and all the variables
-2n+194=0
We move all terms containing n to the left, all other terms to the right
-2n=-194
n=-194/-2
n=+97
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