12+3r=r+2

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Solution for 12+3r=r+2 equation: 



12+3r=r+2

We move all terms to the left:

12+3r-(r+2)=0

We get rid of parentheses

3r-r-2+12=0

We add all the numbers together, and all the variables

2r+10=0

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

2r=-10

r=-10/2

r=-5

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