B=4(r-5)

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Solution for B=4(r-5) equation: 



=4(B-5)

We move all terms to the left:

-(4(B-5))=0



We calculate terms in parentheses: -(4(B-5)), so:

4(B-5)

We multiply parentheses

4B-20

Back to the equation:

-(4B-20)



We get rid of parentheses

-4B+20=0

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

-4B=-20

B=-20/-4

B=+5

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