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5n-7=-15+n+2n
We move all terms to the left:
5n-7-(-15+n+2n)=0
We add all the numbers together, and all the variables
5n-(3n-15)-7=0
We get rid of parentheses
5n-3n+15-7=0
We add all the numbers together, and all the variables
2n+8=0
We move all terms containing n to the left, all other terms to the right
2n=-8
n=-8/2
n=-4
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