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68=2n-7+3n
We move all terms to the left:
68-(2n-7+3n)=0
We add all the numbers together, and all the variables
-(5n-7)+68=0
We get rid of parentheses
-5n+7+68=0
We add all the numbers together, and all the variables
-5n+75=0
We move all terms containing n to the left, all other terms to the right
-5n=-75
n=-75/-5
n=+15
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