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108=-4(5n+7)
We move all terms to the left:
108-(-4(5n+7))=0
We calculate terms in parentheses: -(-4(5n+7)), so:We get rid of parentheses
-4(5n+7)
We multiply parentheses
-20n-28
Back to the equation:
-(-20n-28)
20n+28+108=0
We add all the numbers together, and all the variables
20n+136=0
We move all terms containing n to the left, all other terms to the right
20n=-136
n=-136/20
n=-6+4/5
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