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273=-7(-4-5n)
We move all terms to the left:
273-(-7(-4-5n))=0
We add all the numbers together, and all the variables
-(-7(-5n-4))+273=0
We calculate terms in parentheses: -(-7(-5n-4)), so:We get rid of parentheses
-7(-5n-4)
We multiply parentheses
35n+28
Back to the equation:
-(35n+28)
-35n-28+273=0
We add all the numbers together, and all the variables
-35n+245=0
We move all terms containing n to the left, all other terms to the right
-35n=-245
n=-245/-35
n=+7
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