3r+9-8r+2r=4

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Solution for 3r+9-8r+2r=4 equation: 



3r+9-8r+2r=4

We move all terms to the left:

3r+9-8r+2r-(4)=0

We add all the numbers together, and all the variables

-3r+5=0

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

-3r=-5

r=-5/-3

r=1+2/3

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