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100n-90=10(6n+3)
We move all terms to the left:
100n-90-(10(6n+3))=0
We calculate terms in parentheses: -(10(6n+3)), so:We get rid of parentheses
10(6n+3)
We multiply parentheses
60n+30
Back to the equation:
-(60n+30)
100n-60n-30-90=0
We add all the numbers together, and all the variables
40n-120=0
We move all terms containing n to the left, all other terms to the right
40n=120
n=120/40
n=3
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