9/10=54/r

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Solution for 9/10=54/r equation: 


D( r )

r = 0

r = 0

r = 0

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

9/10 = 54/r // - 54/r

9/10-(54/r) = 0

9/10-54*r^-1 = 0

-54*r^-1 = -9/10 // : -54

r^-1 = 1/60

-1 < 0

1/(r^1) = 1/60 // * r^1

1 = 1/60*r^1 // : 1/60

60 = r^1

r = 60

r = 60

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