4r+2r=42

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Solution for 4r+2r=42 equation: 



4r+2r=42

We move all terms to the left:

4r+2r-(42)=0

We add all the numbers together, and all the variables

6r-42=0

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

6r=42

r=42/6

r=7

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