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15=5+2n
We move all terms to the left:
15-(5+2n)=0
We add all the numbers together, and all the variables
-(2n+5)+15=0
We get rid of parentheses
-2n-5+15=0
We add all the numbers together, and all the variables
-2n+10=0
We move all terms containing n to the left, all other terms to the right
-2n=-10
n=-10/-2
n=+5
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