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-137=-3(6-7n)+7
We move all terms to the left:
-137-(-3(6-7n)+7)=0
We add all the numbers together, and all the variables
-(-3(-7n+6)+7)-137=0
We calculate terms in parentheses: -(-3(-7n+6)+7), so:We get rid of parentheses
-3(-7n+6)+7
We multiply parentheses
21n-18+7
We add all the numbers together, and all the variables
21n-11
Back to the equation:
-(21n-11)
-21n+11-137=0
We add all the numbers together, and all the variables
-21n-126=0
We move all terms containing n to the left, all other terms to the right
-21n=126
n=126/-21
n=-6
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