15r+r-4r-5r+2r=18

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Solution for 15r+r-4r-5r+2r=18 equation: 



15r+r-4r-5r+2r=18

We move all terms to the left:

15r+r-4r-5r+2r-(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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