2=7/r

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Solution for 2=7/r equation: 


D( r )

r = 0

r = 0

r = 0

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

2 = 7/r // - 7/r

2-(7/r) = 0

2-7*r^-1 = 0

-7*r^-1 = -2 // : -7

r^-1 = 2/7

-1 < 0

1/(r^1) = 2/7 // * r^1

1 = 2/7*r^1 // : 2/7

7/2 = r^1

r = 7/2

r = 7/2

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