-10r+20r+3r-8r=-20

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Solution for -10r+20r+3r-8r=-20 equation: 



-10r+20r+3r-8r=-20

We move all terms to the left:

-10r+20r+3r-8r-(-20)=0

We add all the numbers together, and all the variables

5r+20=0

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

5r=-20

r=-20/5

r=-4

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