10r+9=7r

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Solution for 10r+9=7r equation: 



10r+9=7r

We move all terms to the left:

10r+9-(7r)=0

We add all the numbers together, and all the variables

3r+9=0

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

3r=-9

r=-9/3

r=-3

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