280=-10(-10+b)

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Solution for 280=-10(-10+b) equation: 



280=-10(-10+b)

We move all terms to the left:

280-(-10(-10+b))=0

We add all the numbers together, and all the variables

-(-10(b-10))+280=0



We calculate terms in parentheses: -(-10(b-10)), so:

-10(b-10)

We multiply parentheses

-10b+100

Back to the equation:

-(-10b+100)



We get rid of parentheses

10b-100+280=0

We add all the numbers together, and all the variables

10b+180=0

We move all terms containing b to the left, all other terms to the right

10b=-180

b=-180/10

b=-18

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