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100=-4(-4n-1)
We move all terms to the left:
100-(-4(-4n-1))=0
We calculate terms in parentheses: -(-4(-4n-1)), so:We get rid of parentheses
-4(-4n-1)
We multiply parentheses
16n+4
Back to the equation:
-(16n+4)
-16n-4+100=0
We add all the numbers together, and all the variables
-16n+96=0
We move all terms containing n to the left, all other terms to the right
-16n=-96
n=-96/-16
n=+6
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