18-9r=6r-12

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Solution for 18-9r=6r-12 equation: 



18-9r=6r-12

We move all terms to the left:

18-9r-(6r-12)=0

We get rid of parentheses

-9r-6r+12+18=0

We add all the numbers together, and all the variables

-15r+30=0

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

-15r=-30

r=-30/-15

r=+2

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