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15-4n=35+3n
We move all terms to the left:
15-4n-(35+3n)=0
We add all the numbers together, and all the variables
-4n-(3n+35)+15=0
We get rid of parentheses
-4n-3n-35+15=0
We add all the numbers together, and all the variables
-7n-20=0
We move all terms containing n to the left, all other terms to the right
-7n=20
n=20/-7
n=-2+6/7
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