B=3(2.1b-1.2)=4(0.7b+0.85

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Solution for B=3(2.1b-1.2)=4(0.7b+0.85 equation: 



=3(2.1B-1.2)=4(0.7B+0.85

We move all terms to the left:

-(3(2.1B-1.2))=0



We calculate terms in parentheses: -(3(2.1B-1.2)), so:

3(2.1B-1.2)

We multiply parentheses

6B-3.6

Back to the equation:

-(6B-3.6)



We get rid of parentheses

-6B+3.6=0

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

-6B=-3.6

B=-3.6/-6

B=1/1.6666666666667

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