4/r+9/r-7

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Solution for 4/r+9/r-7 equation: 


D( r )

r = 0

r = 0

r = 0

r in (-oo:0) U (0:+oo)

4/r+9/r-7 = 0

13*r^-1 = 7 // : 13

r^-1 = 7/13

-1 < 0

1/(r^1) = 7/13 // * r^1

1 = 7/13*r^1 // : 7/13

13/7 = r^1

r = 13/7

r = 13/7

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