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z in (-oo:+oo)
(9/10)*z-1 = (-19/20)*z+4 // - (-19/20)*z+4
(9/10)*z-((-19/20)*z)-4-1 = 0
(9/10)*z+(19/20)*z-4-1 = 0
37/20*z-5 = 0 // + 5
37/20*z = 5 // : 37/20
z = 5/37/20
z = 100/37
z = 100/37
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