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100=4(4n+5)
We move all terms to the left:
100-(4(4n+5))=0
We calculate terms in parentheses: -(4(4n+5)), so:We get rid of parentheses
4(4n+5)
We multiply parentheses
16n+20
Back to the equation:
-(16n+20)
-16n-20+100=0
We add all the numbers together, and all the variables
-16n+80=0
We move all terms containing n to the left, all other terms to the right
-16n=-80
n=-80/-16
n=+5
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