(10z+5)/(20z+10)

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Solution for (10z+5)/(20z+10) equation: 


D( z )

20*z+10 = 0

20*z+10 = 0

20*z+10 = 0

20*z+10 = 0 // - 10

20*z = -10 // : 20

z = -10/20

z = -1/2

z in (-oo:-1/2) U (-1/2:+oo)

(10*z+5)/(20*z+10) = 0

10*z+5 = 0 // - 5

10*z = -5 // : 10

z = -5/10

z = -1/2

z in { -1/2} 

z belongs to the empty set

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