-0.8b=-4(0.3b+0.4)

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Solution for -0.8b=-4(0.3b+0.4) equation: 



-0.8b=-4(0.3b+0.4)

We move all terms to the left:

-0.8b-(-4(0.3b+0.4))=0



We calculate terms in parentheses: -(-4(0.3b+0.4)), so:

-4(0.3b+0.4)

We multiply parentheses

-0b-1.6

We add all the numbers together, and all the variables

-1b-1.6

Back to the equation:

-(-1b-1.6)



We get rid of parentheses

-0.8b+1b+1.6=0

We add all the numbers together, and all the variables

0.2b+1.6=0

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

0.2b=-1.6

b=-1.6/0.2

b=-8

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