-900=-20(-5b)

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Solution for -900=-20(-5b) equation: 



-900=-20(-5b)

We move all terms to the left:

-900-(-20(-5b))=0



We calculate terms in parentheses: -(-20(-5b)), so:

-20(-5b)

We multiply parentheses

100b

Back to the equation:

-(100b)



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

-100b=900

b=900/-100

b=-9

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