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-3n=-2n-20
We move all terms to the left:
-3n-(-2n-20)=0
We get rid of parentheses
-3n+2n+20=0
We add all the numbers together, and all the variables
-1n+20=0
We move all terms containing n to the left, all other terms to the right
-n=-20
n=-20/-1
n=+20
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