3r+6=42

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Solution for 3r+6=42 equation: 



3r+6=42

We move all terms to the left:

3r+6-(42)=0

We add all the numbers together, and all the variables

3r-36=0

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

3r=36

r=36/3

r=12

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