R2-4r=30

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Solution for R2-4r=30 equation: 



2-4R=30

We move all terms to the left:

2-4R-(30)=0

We add all the numbers together, and all the variables

-4R-28=0

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

-4R=28

R=28/-4

R=-7

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