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600=-10(7n+3)
We move all terms to the left:
600-(-10(7n+3))=0
We calculate terms in parentheses: -(-10(7n+3)), so:We get rid of parentheses
-10(7n+3)
We multiply parentheses
-70n-30
Back to the equation:
-(-70n-30)
70n+30+600=0
We add all the numbers together, and all the variables
70n+630=0
We move all terms containing n to the left, all other terms to the right
70n=-630
n=-630/70
n=-9
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