4/9=10/r

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Solution for 4/9=10/r equation: 


D( r )

r = 0

r = 0

r = 0

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

4/9 = 10/r // - 10/r

4/9-(10/r) = 0

4/9-10*r^-1 = 0

-10*r^-1 = -4/9 // : -10

r^-1 = 2/45

-1 < 0

1/(r^1) = 2/45 // * r^1

1 = 2/45*r^1 // : 2/45

45/2 = r^1

r = 45/2

r = 45/2

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