4/r+8/r-7

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Solution for 4/r+8/r-7 equation: 


D( r )

r = 0

r = 0

r = 0

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

4/r+8/r-7 = 0

12*r^-1 = 7 // : 12

r^-1 = 7/12

-1 < 0

1/(r^1) = 7/12 // * r^1

1 = 7/12*r^1 // : 7/12

12/7 = r^1

r = 12/7

r = 12/7

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