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-90=-2(1-7n)-3n
We move all terms to the left:
-90-(-2(1-7n)-3n)=0
We add all the numbers together, and all the variables
-(-2(-7n+1)-3n)-90=0
We calculate terms in parentheses: -(-2(-7n+1)-3n), so:We get rid of parentheses
-2(-7n+1)-3n
We add all the numbers together, and all the variables
-3n-2(-7n+1)
We multiply parentheses
-3n+14n-2
We add all the numbers together, and all the variables
11n-2
Back to the equation:
-(11n-2)
-11n+2-90=0
We add all the numbers together, and all the variables
-11n-88=0
We move all terms containing n to the left, all other terms to the right
-11n=88
n=88/-11
n=-8
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