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40-12n=-13n-3n
We move all terms to the left:
40-12n-(-13n-3n)=0
We add all the numbers together, and all the variables
-12n-(-16n)+40=0
We get rid of parentheses
-12n+16n+40=0
We add all the numbers together, and all the variables
4n+40=0
We move all terms containing n to the left, all other terms to the right
4n=-40
n=-40/4
n=-10
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