13r-12r-r+8r+10r=18

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Solution for 13r-12r-r+8r+10r=18 equation: 



13r-12r-r+8r+10r=18

We move all terms to the left:

13r-12r-r+8r+10r-(18)=0

We add all the numbers together, and all the variables

18r-18=0

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

18r=18

r=18/18

r=1

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