84/r+315/r+7=399

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Solution for 84/r+315/r+7=399 equation: 



84/r+315/r+7=399

We move all terms to the left:

84/r+315/r+7-(399)=0



Domain of the equation: r!=0

r∈R



We add all the numbers together, and all the variables

84/r+315/r-392=0

We multiply all the terms by the denominator


-392*r+84+315=0

We add all the numbers together, and all the variables

-392r+399=0

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

-392r=-399

r=-399/-392

r=1+1/56

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