-480=-20(-3b)

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Solution for -480=-20(-3b) equation: 



-480=-20(-3b)

We move all terms to the left:

-480-(-20(-3b))=0



We calculate terms in parentheses: -(-20(-3b)), so:

-20(-3b)

We multiply parentheses

60b

Back to the equation:

-(60b)



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

-60b=480

b=480/-60

b=-8

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