220=-4(1-7b)

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Solution for 220=-4(1-7b) equation: 



220=-4(1-7b)

We move all terms to the left:

220-(-4(1-7b))=0

We add all the numbers together, and all the variables

-(-4(-7b+1))+220=0



We calculate terms in parentheses: -(-4(-7b+1)), so:

-4(-7b+1)

We multiply parentheses

28b-4

Back to the equation:

-(28b-4)



We get rid of parentheses

-28b+4+220=0

We add all the numbers together, and all the variables

-28b+224=0

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

-28b=-224

b=-224/-28

b=+8

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