50=2(r-30)

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Solution for 50=2(r-30) equation: 



50=2(r-30)

We move all terms to the left:

50-(2(r-30))=0



We calculate terms in parentheses: -(2(r-30)), so:

2(r-30)

We multiply parentheses

2r-60

Back to the equation:

-(2r-60)



We get rid of parentheses

-2r+60+50=0

We add all the numbers together, and all the variables

-2r+110=0

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

-2r=-110

r=-110/-2

r=+55

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