12r-9=10r-15

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Solution for 12r-9=10r-15 equation: 



12r-9=10r-15

We move all terms to the left:

12r-9-(10r-15)=0

We get rid of parentheses

12r-10r+15-9=0

We add all the numbers together, and all the variables

2r+6=0

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

2r=-6

r=-6/2

r=-3

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