15r+r-13+r=20

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Solution for 15r+r-13+r=20 equation: 



15r+r-13+r=20

We move all terms to the left:

15r+r-13+r-(20)=0

We add all the numbers together, and all the variables

17r-33=0

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

17r=33

r=33/17

r=1+16/17

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