R=7-l

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Solution for R=7-l equation: 



=7-R

We move all terms to the left:

-(7-R)=0

We add all the numbers together, and all the variables

-(-1R+7)=0

We get rid of parentheses

1R-7=0

We add all the numbers together, and all the variables

R-7=0

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

R=7

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