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z in (-oo:+oo)
(2*z)/5-((4*z-3)/10) = (1-z)/10 // - (1-z)/10
(2*z)/5-((4*z-3)/10)-((1-z)/10) = 0
(-1*(4*z-3))/10+(-1*(1-z))/10+(2*z)/5 = 0
(-1*5*(4*z-3))/(5*10)+(-1*5*(1-z))/(5*10)+(2*10*z)/(5*10) = 0
2*10*z-1*5*(4*z-3)-1*5*(1-z) = 0
20*z-15*z+10 = 0
5*z+10 = 0
(5*z+10)/(5*10) = 0
(5*z+10)/(5*10) = 0 // * 5*10
5*z+10 = 0
5*z+10 = 0 // - 10
5*z = -10 // : 5
z = -10/5
z = -2
z = -2
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