3r-r=20

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Solution for 3r-r=20 equation: 



3r-r=20

We move all terms to the left:

3r-r-(20)=0

We add all the numbers together, and all the variables

2r-20=0

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

2r=20

r=20/2

r=10

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