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-(-5-7n)-7(3-5n)=68
We move all terms to the left:
-(-5-7n)-7(3-5n)-(68)=0
We add all the numbers together, and all the variables
-(-7n-5)-7(-5n+3)-68=0
We multiply parentheses
-(-7n-5)+35n-21-68=0
We get rid of parentheses
7n+35n+5-21-68=0
We add all the numbers together, and all the variables
42n-84=0
We move all terms containing n to the left, all other terms to the right
42n=84
n=84/42
n=2
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