280=5(7-7n)

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Solution for 280=5(7-7n) equation: 



280=5(7-7n)

We move all terms to the left:

280-(5(7-7n))=0

We add all the numbers together, and all the variables

-(5(-7n+7))+280=0



We calculate terms in parentheses: -(5(-7n+7)), so:

5(-7n+7)

We multiply parentheses

-35n+35

Back to the equation:

-(-35n+35)



We get rid of parentheses

35n-35+280=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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