11r-142=13r-172

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Solution for 11r-142=13r-172 equation: 



11r-142=13r-172

We move all terms to the left:

11r-142-(13r-172)=0

We get rid of parentheses

11r-13r+172-142=0

We add all the numbers together, and all the variables

-2r+30=0

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

-2r=-30

r=-30/-2

r=+15

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