6/r+7/r-4

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Solution for 6/r+7/r-4 equation: 


D( r )

r = 0

r = 0

r = 0

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

6/r+7/r-4 = 0

13*r^-1 = 4 // : 13

r^-1 = 4/13

-1 < 0

1/(r^1) = 4/13 // * r^1

1 = 4/13*r^1 // : 4/13

13/4 = r^1

r = 13/4

r = 13/4

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