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79=7n+2
We move all terms to the left:
79-(7n+2)=0
We get rid of parentheses
-7n-2+79=0
We add all the numbers together, and all the variables
-7n+77=0
We move all terms containing n to the left, all other terms to the right
-7n=-77
n=-77/-7
n=+11
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