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-7-3n=2n+3
We move all terms to the left:
-7-3n-(2n+3)=0
We get rid of parentheses
-3n-2n-3-7=0
We add all the numbers together, and all the variables
-5n-10=0
We move all terms containing n to the left, all other terms to the right
-5n=10
n=10/-5
n=-2
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