12r-18=13r=18

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Solution for 12r-18=13r=18 equation: 



12r-18=13r=18

We move all terms to the left:

12r-18-(13r)=0

We add all the numbers together, and all the variables

-1r-18=0

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

-r=18

r=18/-1

r=-18

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