-20r+10r=20

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



-20r+10r=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

-10r-20=0

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

-10r=20

r=20/-10

r=-2

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