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4=3(n-15)-8
We move all terms to the left:
4-(3(n-15)-8)=0
We calculate terms in parentheses: -(3(n-15)-8), so:We get rid of parentheses
3(n-15)-8
We multiply parentheses
3n-45-8
We add all the numbers together, and all the variables
3n-53
Back to the equation:
-(3n-53)
-3n+53+4=0
We add all the numbers together, and all the variables
-3n+57=0
We move all terms containing n to the left, all other terms to the right
-3n=-57
n=-57/-3
n=+19
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