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-216=-6(1-7n)
We move all terms to the left:
-216-(-6(1-7n))=0
We add all the numbers together, and all the variables
-(-6(-7n+1))-216=0
We calculate terms in parentheses: -(-6(-7n+1)), so:We get rid of parentheses
-6(-7n+1)
We multiply parentheses
42n-6
Back to the equation:
-(42n-6)
-42n+6-216=0
We add all the numbers together, and all the variables
-42n-210=0
We move all terms containing n to the left, all other terms to the right
-42n=210
n=210/-42
n=-5
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