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-10(n-5)=-90
We move all terms to the left:
-10(n-5)-(-90)=0
We add all the numbers together, and all the variables
-10(n-5)+90=0
We multiply parentheses
-10n+50+90=0
We add all the numbers together, and all the variables
-10n+140=0
We move all terms containing n to the left, all other terms to the right
-10n=-140
n=-140/-10
n=+14
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