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75=-3(6n+5)
We move all terms to the left:
75-(-3(6n+5))=0
We calculate terms in parentheses: -(-3(6n+5)), so:We get rid of parentheses
-3(6n+5)
We multiply parentheses
-18n-15
Back to the equation:
-(-18n-15)
18n+15+75=0
We add all the numbers together, and all the variables
18n+90=0
We move all terms containing n to the left, all other terms to the right
18n=-90
n=-90/18
n=-5
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