r-4+3r=-20

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Solution for r-4+3r=-20 equation: 



r-4+3r=-20

We move all terms to the left:

r-4+3r-(-20)=0

We add all the numbers together, and all the variables

4r+16=0

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

4r=-16

r=-16/4

r=-4

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