9/8=11/r

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Solution for 9/8=11/r equation: 


D( r )

r = 0

r = 0

r = 0

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

9/8 = 11/r // - 11/r

9/8-(11/r) = 0

9/8-11*r^-1 = 0

-11*r^-1 = -9/8 // : -11

r^-1 = 9/88

-1 < 0

1/(r^1) = 9/88 // * r^1

1 = 9/88*r^1 // : 9/88

88/9 = r^1

r = 88/9

r = 88/9

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