-30=r-20

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Solution for -30=r-20 equation: 



-30=r-20

We move all terms to the left:

-30-(r-20)=0

We get rid of parentheses

-r+20-30=0

We add all the numbers together, and all the variables

-1r-10=0

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

-r=10

r=10/-1

r=-10

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