-9/r=18

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Solution for -9/r=18 equation: 



-9/r=18

We move all terms to the left:

-9/r-(18)=0



Domain of the equation: r!=0

r∈R



We multiply all the terms by the denominator


-18*r-9=0

We add all the numbers together, and all the variables

-18r-9=0

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

-18r=9

r=9/-18

r=-1/2

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