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z in (-oo:+oo)
(2*(z-8))/12 = 3/2 // - 3/2
(2*(z-8))/12-(3/2) = 0
(2*(z-8))/12-3/2 = 0
(2^2*(z-8))/(2*12)+(-3*12)/(2*12) = 0
2^2*(z-8)-3*12 = 0
4*z-68 = 0
(4*z-68)/(2*12) = 0
(4*z-68)/(2*12) = 0 // * 2*12
4*z-68 = 0
4*z-68 = 0 // + 68
4*z = 68 // : 4
z = 68/4
z = 17
z = 17
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