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2n+7=-3n-42
We move all terms to the left:
2n+7-(-3n-42)=0
We get rid of parentheses
2n+3n+42+7=0
We add all the numbers together, and all the variables
5n+49=0
We move all terms containing n to the left, all other terms to the right
5n=-49
n=-49/5
n=-9+4/5
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