3r+4r=84

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Solution for 3r+4r=84 equation: 



3r+4r=84

We move all terms to the left:

3r+4r-(84)=0

We add all the numbers together, and all the variables

7r-84=0

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

7r=84

r=84/7

r=12

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