3r+9=4r+2

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Solution for 3r+9=4r+2 equation: 



3r+9=4r+2

We move all terms to the left:

3r+9-(4r+2)=0

We get rid of parentheses

3r-4r-2+9=0

We add all the numbers together, and all the variables

-1r+7=0

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

-r=-7

r=-7/-1

r=+7

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