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z in (-oo:+oo)
(1/4)*(5-2*z) = (1/6)*(5-(3*z)) // - (1/6)*(5-(3*z))
(1/4)*(5-2*z)-((1/6)*(5-(3*z))) = 0
(1/4)*(5-2*z)+(-1/6)*(5-3*z) = 0
1/4*(5-2*z)-1/6*(5-3*z) = 0
1/4*(5-2*z)-1/6*(5-3*z) = 0
5/12 = 0
5/12 = 0
5/12 = 0 // * 12
5 = 0
z belongs to the empty set
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