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104=-7n+5(4-n)
We move all terms to the left:
104-(-7n+5(4-n))=0
We add all the numbers together, and all the variables
-(-7n+5(-1n+4))+104=0
We calculate terms in parentheses: -(-7n+5(-1n+4)), so:We get rid of parentheses
-7n+5(-1n+4)
We multiply parentheses
-7n-5n+20
We add all the numbers together, and all the variables
-12n+20
Back to the equation:
-(-12n+20)
12n-20+104=0
We add all the numbers together, and all the variables
12n+84=0
We move all terms containing n to the left, all other terms to the right
12n=-84
n=-84/12
n=-7
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