9/10=4/r

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Solution for 9/10=4/r equation: 


D( r )

r = 0

r = 0

r = 0

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

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

9/10-(4/r) = 0

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

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

r^-1 = 9/40

-1 < 0

1/(r^1) = 9/40 // * r^1

1 = 9/40*r^1 // : 9/40

40/9 = r^1

r = 40/9

r = 40/9

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