-2r+4r=9

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Solution for -2r+4r=9 equation: 



-2r+4r=9

We move all terms to the left:

-2r+4r-(9)=0

We add all the numbers together, and all the variables

2r-9=0

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

2r=9

r=9/2

r=4+1/2

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