72/r=-9

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Solution for 72/r=-9 equation: 



72/r=-9

We move all terms to the left:

72/r-(-9)=0



Domain of the equation: r!=0

r∈R



We add all the numbers together, and all the variables

72/r+9=0

We multiply all the terms by the denominator


9*r+72=0

We add all the numbers together, and all the variables

9r+72=0

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

9r=-72

r=-72/9

r=-8

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