40-5b=3(7-8b)

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Solution for 40-5b=3(7-8b) equation: 



40-5b=3(7-8b)

We move all terms to the left:

40-5b-(3(7-8b))=0

We add all the numbers together, and all the variables

-5b-(3(-8b+7))+40=0



We calculate terms in parentheses: -(3(-8b+7)), so:

3(-8b+7)

We multiply parentheses

-24b+21

Back to the equation:

-(-24b+21)



We get rid of parentheses

-5b+24b-21+40=0

We add all the numbers together, and all the variables

19b+19=0

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

19b=-19

b=-19/19

b=-1

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