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3(3n-5)+4(5n+2)=3n+123
We move all terms to the left:
3(3n-5)+4(5n+2)-(3n+123)=0
We multiply parentheses
9n+20n-(3n+123)-15+8=0
We get rid of parentheses
9n+20n-3n-123-15+8=0
We add all the numbers together, and all the variables
26n-130=0
We move all terms containing n to the left, all other terms to the right
26n=130
n=130/26
n=5
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