R=4(b+5)

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Solution for R=4(b+5) equation: 



=4(R+5)

We move all terms to the left:

-(4(R+5))=0



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

4(R+5)

We multiply parentheses

4R+20

Back to the equation:

-(4R+20)



We get rid of parentheses

-4R-20=0

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

-4R=20

R=20/-4

R=-5

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