12+0.8b=0.4(3b-1)

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Solution for 12+0.8b=0.4(3b-1) equation: 



12+0.8b=0.4(3b-1)

We move all terms to the left:

12+0.8b-(0.4(3b-1))=0



We calculate terms in parentheses: -(0.4(3b-1)), so:

0.4(3b-1)

We multiply parentheses

1.2b-0.4

Back to the equation:

-(1.2b-0.4)



We get rid of parentheses

0.8b-1.2b+0.4+12=0

We add all the numbers together, and all the variables

-0.4b+12.4=0

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

-0.4b=-12.4

b=-12.4/-0.4

b=+31

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