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(-2n-4)=5n-5
We move all terms to the left:
(-2n-4)-(5n-5)=0
We get rid of parentheses
-2n-5n-4+5=0
We add all the numbers together, and all the variables
-7n+1=0
We move all terms containing n to the left, all other terms to the right
-7n=-1
n=-1/-7
n=1/7
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