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z in (-oo:+oo)
(1/4)*(z-6) = (1/4)*z-(3/2) // - (1/4)*z-(3/2)
(1/4)*(z-6)-((1/4)*z)+3/2 = 0
(1/4)*(z-6)+(-1/4)*z+3/2 = 0
1/4*(z-6)-z/4+3/2 = 0
(1/4*2*4*(z-6))/(2*4)+(2*(-z))/(2*4)+(3*4)/(2*4) = 0
1/4*2*4*(z-6)+2*(-z)+3*4 = 0
12-12 = 0
0 = 0
0/(2*4) = 0
0/(2*4) = 0 // * 2*4
0 = 0
z belongs to the empty set
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