-217=-7b+7(1-3b)

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Solution for -217=-7b+7(1-3b) equation: 



-217=-7b+7(1-3b)

We move all terms to the left:

-217-(-7b+7(1-3b))=0

We add all the numbers together, and all the variables

-(-7b+7(-3b+1))-217=0



We calculate terms in parentheses: -(-7b+7(-3b+1)), so:

-7b+7(-3b+1)

We multiply parentheses

-7b-21b+7

We add all the numbers together, and all the variables

-28b+7

Back to the equation:

-(-28b+7)



We get rid of parentheses

28b-7-217=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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