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131=7n+5
We move all terms to the left:
131-(7n+5)=0
We get rid of parentheses
-7n-5+131=0
We add all the numbers together, and all the variables
-7n+126=0
We move all terms containing n to the left, all other terms to the right
-7n=-126
n=-126/-7
n=+18
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