12-9+10r=7r-9-2r+27

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Solution for 12-9+10r=7r-9-2r+27 equation: 



12-9+10r=7r-9-2r+27

We move all terms to the left:

12-9+10r-(7r-9-2r+27)=0

We add all the numbers together, and all the variables

10r-(5r+18)+12-9=0

We add all the numbers together, and all the variables

10r-(5r+18)+3=0

We get rid of parentheses

10r-5r-18+3=0

We add all the numbers together, and all the variables

5r-15=0

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

5r=15

r=15/5

r=3

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