2r-9=8r-12

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Solution for 2r-9=8r-12 equation: 



2r-9=8r-12

We move all terms to the left:

2r-9-(8r-12)=0

We get rid of parentheses

2r-8r+12-9=0

We add all the numbers together, and all the variables

-6r+3=0

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

-6r=-3

r=-3/-6

r=1/2

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