3r+r=4

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Solution for 3r+r=4 equation: 



3r+r=4

We move all terms to the left:

3r+r-(4)=0

We add all the numbers together, and all the variables

4r-4=0

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

4r=4

r=4/4

r=1

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