30=r-50

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Solution for 30=r-50 equation: 



30=r-50

We move all terms to the left:

30-(r-50)=0

We get rid of parentheses

-r+50+30=0

We add all the numbers together, and all the variables

-1r+80=0

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

-r=-80

r=-80/-1

r=+80

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