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5(1+3n)=125
We move all terms to the left:
5(1+3n)-(125)=0
We add all the numbers together, and all the variables
5(3n+1)-125=0
We multiply parentheses
15n+5-125=0
We add all the numbers together, and all the variables
15n-120=0
We move all terms containing n to the left, all other terms to the right
15n=120
n=120/15
n=8
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