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z in (-oo:+oo)
12-7*z = 20*z-((1/3)*z)+8 // - 20*z-((1/3)*z)+8
(1/3)*z-7*z-(20*z)-8+12 = 0
(1/3)*z-7*z-20*z-8+12 = 0
4-80/3*z = 0 // - 4
-80/3*z = -4 // : -80/3
z = -4/(-80/3)
z = 3/20
z = 3/20
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