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