20r-2r+2r+3r-18r=15

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Solution for 20r-2r+2r+3r-18r=15 equation: 



20r-2r+2r+3r-18r=15

We move all terms to the left:

20r-2r+2r+3r-18r-(15)=0

We add all the numbers together, and all the variables

5r-15=0

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

5r=15

r=15/5

r=3

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