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z in (-oo:+oo)
9/12-((4/12)*z) = 3/12 // - 3/12
9/12-((4/12)*z)-(3/12) = 0
(-1/3)*z+9/12-1/4 = 0
1/2-1/3*z = 0 // - 1/2
-1/3*z = -1/2 // : -1/3
z = -1/2/(-1/3)
z = 3/2
z = 3/2
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