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z in (-oo:+oo)
((6*z)/6)*z+4 = 12 // - 12
((6*z)/6)*z-12+4 = 0
1*z^2 = 8 // : 1
z^2 = 8
z^2 = 8 // ^ 1/2
abs(z) = 2*2^(1/2)
z = 2*2^(1/2) or z = -(2*2^(1/2))
z in { 2*2^(1/2), -(2*2^(1/2)) }
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