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z in (-oo:+oo)
(4/15)*z = 1/10-(4/9) // - 1/10-(4/9)
(4/15)*z-(1/10)+4/9 = 0
(4/15)*z-1/10+4/9 = 0
4/15*z+31/90 = 0 // - 31/90
4/15*z = -31/90 // : 4/15
z = -31/90/4/15
z = -31/24
z = -31/24
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