2/r-7=8/r

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Solution for 2/r-7=8/r equation: 


D( r )

r = 0

r = 0

r = 0

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

2/r-7 = 8/r // - 8/r

2/r-(8/r)-7 = 0

2/r-8*r^-1-7 = 0

-6*r^-1 = 7 // : -6

r^-1 = -7/6

-1 < 0

1/(r^1) = -7/6 // * r^1

1 = -7/6*r^1 // : -7/6

-6/7 = r^1

r = -6/7

r = -6/7

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