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4+3n=39+10n
We move all terms to the left:
4+3n-(39+10n)=0
We add all the numbers together, and all the variables
3n-(10n+39)+4=0
We get rid of parentheses
3n-10n-39+4=0
We add all the numbers together, and all the variables
-7n-35=0
We move all terms containing n to the left, all other terms to the right
-7n=35
n=35/-7
n=-5
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