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660=30(n+2)
We move all terms to the left:
660-(30(n+2))=0
We calculate terms in parentheses: -(30(n+2)), so:We get rid of parentheses
30(n+2)
We multiply parentheses
30n+60
Back to the equation:
-(30n+60)
-30n-60+660=0
We add all the numbers together, and all the variables
-30n+600=0
We move all terms containing n to the left, all other terms to the right
-30n=-600
n=-600/-30
n=+20
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