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5(3n-6)=30
We move all terms to the left:
5(3n-6)-(30)=0
We multiply parentheses
15n-30-30=0
We add all the numbers together, and all the variables
15n-60=0
We move all terms containing n to the left, all other terms to the right
15n=60
n=60/15
n=4
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