9/r=12

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Solution for 9/r=12 equation: 



9/r=12

We move all terms to the left:

9/r-(12)=0



Domain of the equation: r!=0

r∈R



We multiply all the terms by the denominator


-12*r+9=0

We add all the numbers together, and all the variables

-12r+9=0

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

-12r=-9

r=-9/-12

r=3/4

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