2r+r+3r+4r-r=18

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Solution for 2r+r+3r+4r-r=18 equation: 



2r+r+3r+4r-r=18

We move all terms to the left:

2r+r+3r+4r-r-(18)=0

We add all the numbers together, and all the variables

9r-18=0

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

9r=18

r=18/9

r=2

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