12r-r+9r-10r=90

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Solution for 12r-r+9r-10r=90 equation: 



12r-r+9r-10r=90

We move all terms to the left:

12r-r+9r-10r-(90)=0

We add all the numbers together, and all the variables

10r-90=0

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

10r=90

r=90/10

r=9

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