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75=3(-5n-5)
We move all terms to the left:
75-(3(-5n-5))=0
We calculate terms in parentheses: -(3(-5n-5)), so:We get rid of parentheses
3(-5n-5)
We multiply parentheses
-15n-15
Back to the equation:
-(-15n-15)
15n+15+75=0
We add all the numbers together, and all the variables
15n+90=0
We move all terms containing n to the left, all other terms to the right
15n=-90
n=-90/15
n=-6
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