72/r=18

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Solution for 72/r=18 equation: 



72/r=18

We move all terms to the left:

72/r-(18)=0



Domain of the equation: r!=0

r∈R



We multiply all the terms by the denominator


-18*r+72=0

We add all the numbers together, and all the variables

-18r+72=0

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

-18r=-72

r=-72/-18

r=+4

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