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100=-4(6n-7)
We move all terms to the left:
100-(-4(6n-7))=0
We calculate terms in parentheses: -(-4(6n-7)), so:We get rid of parentheses
-4(6n-7)
We multiply parentheses
-24n+28
Back to the equation:
-(-24n+28)
24n-28+100=0
We add all the numbers together, and all the variables
24n+72=0
We move all terms containing n to the left, all other terms to the right
24n=-72
n=-72/24
n=-3
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