18-3r+r=12

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Solution for 18-3r+r=12 equation: 



18-3r+r=12

We move all terms to the left:

18-3r+r-(12)=0

We add all the numbers together, and all the variables

-2r+6=0

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

-2r=-6

r=-6/-2

r=+3

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