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6(2n+5)=90
We move all terms to the left:
6(2n+5)-(90)=0
We multiply parentheses
12n+30-90=0
We add all the numbers together, and all the variables
12n-60=0
We move all terms containing n to the left, all other terms to the right
12n=60
n=60/12
n=5
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