r+1+3r=13

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Solution for r+1+3r=13 equation: 



r+1+3r=13

We move all terms to the left:

r+1+3r-(13)=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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