0=7r+2r

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Solution for 0=7r+2r equation: 



0=7r+2r

We move all terms to the left:

0-(7r+2r)=0

We add all the numbers together, and all the variables

-(+9r)+0=0

We add all the numbers together, and all the variables

-(+9r)=0

We get rid of parentheses

-9r=0

r=0/-9

r=0

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