-20=-2(10-4b)

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Solution for -20=-2(10-4b) equation: 



-20=-2(10-4b)

We move all terms to the left:

-20-(-2(10-4b))=0

We add all the numbers together, and all the variables

-(-2(-4b+10))-20=0



We calculate terms in parentheses: -(-2(-4b+10)), so:

-2(-4b+10)

We multiply parentheses

8b-20

Back to the equation:

-(8b-20)



We get rid of parentheses

-8b+20-20=0

We add all the numbers together, and all the variables

-8b=0

b=0/-8

b=0

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