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-13n-142=-15n
We move all terms to the left:
-13n-142-(-15n)=0
We get rid of parentheses
-13n+15n-142=0
We add all the numbers together, and all the variables
2n-142=0
We move all terms containing n to the left, all other terms to the right
2n=142
n=142/2
n=71
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