-10-20=-20r

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



-10-20=-20r

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-20r)-30=0

We get rid of parentheses

20r-30=0

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

20r=30

r=30/20

r=1+1/2

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