4r-2r+4-2=42

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Solution for 4r-2r+4-2=42 equation: 



4r-2r+4-2=42

We move all terms to the left:

4r-2r+4-2-(42)=0

We add all the numbers together, and all the variables

2r-40=0

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

2r=40

r=40/2

r=20

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