3r-13=20

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Solution for 3r-13=20 equation: 



3r-13=20

We move all terms to the left:

3r-13-(20)=0

We add all the numbers together, and all the variables

3r-33=0

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

3r=33

r=33/3

r=11

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