12-7r=2r+30

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Solution for 12-7r=2r+30 equation: 



12-7r=2r+30

We move all terms to the left:

12-7r-(2r+30)=0

We get rid of parentheses

-7r-2r-30+12=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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