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5n-10=7n+10
We move all terms to the left:
5n-10-(7n+10)=0
We get rid of parentheses
5n-7n-10-10=0
We add all the numbers together, and all the variables
-2n-20=0
We move all terms containing n to the left, all other terms to the right
-2n=20
n=20/-2
n=-10
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