R2-4r-91=7

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Solution for R2-4r-91=7 equation: 



2-4R-91=7

We move all terms to the left:

2-4R-91-(7)=0

We add all the numbers together, and all the variables

-4R-96=0

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

-4R=96

R=96/-4

R=-24

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