12+2r=22

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Solution for 12+2r=22 equation: 



12+2r=22

We move all terms to the left:

12+2r-(22)=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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