18-3r=42

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Solution for 18-3r=42 equation: 



18-3r=42

We move all terms to the left:

18-3r-(42)=0

We add all the numbers together, and all the variables

-3r-24=0

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

-3r=24

r=24/-3

r=-8

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