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66=7n-4
We move all terms to the left:
66-(7n-4)=0
We get rid of parentheses
-7n+4+66=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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