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4(3n-5)+5(5n+2)=3n+126
We move all terms to the left:
4(3n-5)+5(5n+2)-(3n+126)=0
We multiply parentheses
12n+25n-(3n+126)-20+10=0
We get rid of parentheses
12n+25n-3n-126-20+10=0
We add all the numbers together, and all the variables
34n-136=0
We move all terms containing n to the left, all other terms to the right
34n=136
n=136/34
n=4
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