3r+12=4r

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Solution for 3r+12=4r equation: 



3r+12=4r

We move all terms to the left:

3r+12-(4r)=0

We add all the numbers together, and all the variables

-1r+12=0

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

-r=-12

r=-12/-1

r=+12

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