B=(10x-30)

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Solution for B=(10x-30) equation: 



=(10B-30)

We move all terms to the left:

-((10B-30))=0



We calculate terms in parentheses: -((10B-30)), so:

(10B-30)

We get rid of parentheses

10B-30

Back to the equation:

-(10B-30)



We get rid of parentheses

-10B+30=0

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

-10B=-30

B=-30/-10

B=+3

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