3r-7r=12

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Solution for 3r-7r=12 equation: 



3r-7r=12

We move all terms to the left:

3r-7r-(12)=0

We add all the numbers together, and all the variables

-4r-12=0

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

-4r=12

r=12/-4

r=-3

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