-20=-4(b-5)

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Solution for -20=-4(b-5) equation: 



-20=-4(b-5)

We move all terms to the left:

-20-(-4(b-5))=0



We calculate terms in parentheses: -(-4(b-5)), so:

-4(b-5)

We multiply parentheses

-4b+20

Back to the equation:

-(-4b+20)



We get rid of parentheses

4b-20-20=0

We add all the numbers together, and all the variables

4b-40=0

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

4b=40

b=40/4

b=10

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