12/5=(3+z)/z

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Solution for 12/5=(3+z)/z equation: 


D( z )

z = 0

z = 0

z = 0

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

12/5 = (z+3)/z // - (z+3)/z

12/5-((z+3)/z) = 0

(-1*(z+3))/z+12/5 = 0

(-1*5*(z+3))/(5*z)+(12*z)/(5*z) = 0

12*z-1*5*(z+3) = 0

7*z-15 = 0

(7*z-15)/(5*z) = 0

(7*z-15)/(5*z) = 0 // * 5*z

7*z-15 = 0

7*z-15 = 0 // + 15

7*z = 15 // : 7

z = 15/7

z = 15/7

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