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55=7n-15
We move all terms to the left:
55-(7n-15)=0
We get rid of parentheses
-7n+15+55=0
We add all the numbers together, and all the variables
-7n+70=0
We move all terms containing n to the left, all other terms to the right
-7n=-70
n=-70/-7
n=+10
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