11r-13=42

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Solution for 11r-13=42 equation: 



11r-13=42

We move all terms to the left:

11r-13-(42)=0

We add all the numbers together, and all the variables

11r-55=0

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

11r=55

r=55/11

r=5

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