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z in (-oo:+oo)
(-2/3)*z-(1/2) = 4/5 // - 4/5
(-2/3)*z-(1/2)-(4/5) = 0
(-2/3)*z-1/2-4/5 = 0
-2/3*z-13/10 = 0 // + 13/10
-2/3*z = 13/10 // : -2/3
z = 13/10/(-2/3)
z = -39/20
z = -39/20
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