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5(3-5n)=90
We move all terms to the left:
5(3-5n)-(90)=0
We add all the numbers together, and all the variables
5(-5n+3)-90=0
We multiply parentheses
-25n+15-90=0
We add all the numbers together, and all the variables
-25n-75=0
We move all terms containing n to the left, all other terms to the right
-25n=75
n=75/-25
n=-3
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