6r-9r=-18

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



6r-9r=-18

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3r+18=0

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

-3r=-18

r=-18/-3

r=+6

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