7r-3r=12

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Solution for 7r-3r=12 equation:



7r-3r=12
We move all terms to the left:
7r-3r-(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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