2/5=18/r

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Solution for 2/5=18/r equation: 


D( r )

r = 0

r = 0

r = 0

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

2/5 = 18/r // - 18/r

2/5-(18/r) = 0

2/5-18*r^-1 = 0

-18*r^-1 = -2/5 // : -18

r^-1 = 1/45

-1 < 0

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

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

45 = r^1

r = 45

r = 45

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