RT=4x+21

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Solution for RT=4x+21 equation: 



=4R+21

We move all terms to the left:

-(4R+21)=0

We get rid of parentheses

-4R-21=0

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

-4R=21

R=21/-4

R=-5+1/4

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