40/5=96/r

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Solution for 40/5=96/r equation: 


D( r )

r = 0

r = 0

r = 0

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

40/5 = 96/r // - 96/r

40/5-(96/r) = 0

40/5-96*r^-1 = 0

-96*r^-1 = -8 // : -96

r^-1 = 1/12

-1 < 0

1/(r^1) = 1/12 // * r^1

1 = 1/12*r^1 // : 1/12

12 = r^1

r = 12

r = 12

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