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4(3-4n)-7(5-4n)=0
We add all the numbers together, and all the variables
4(-4n+3)-7(-4n+5)=0
We multiply parentheses
-16n+28n+12-35=0
We add all the numbers together, and all the variables
12n-23=0
We move all terms containing n to the left, all other terms to the right
12n=23
n=23/12
n=1+11/12
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