9/4=(r-10)/r

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Solution for 9/4=(r-10)/r equation: 


D( r )

r = 0

r = 0

r = 0

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

9/4 = (r-10)/r // - (r-10)/r

9/4-((r-10)/r) = 0

(-1*(r-10))/r+9/4 = 0

(-1*4*(r-10))/(4*r)+(9*r)/(4*r) = 0

9*r-1*4*(r-10) = 0

5*r+40 = 0

(5*r+40)/(4*r) = 0

(5*r+40)/(4*r) = 0 // * 4*r

5*r+40 = 0

5*r+40 = 0 // - 40

5*r = -40 // : 5

r = -40/5

r = -8

r = -8

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