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z in (-oo:+oo)
4/3-5/3 = (-4/5)*z+(2/5)*z // - (-4/5)*z+(2/5)*z
4/3-((-4/5)*z)-((2/5)*z)-5/3 = 0
(4/5)*z+(-2/5)*z-5/3+4/3 = 0
2/5*z-1/3 = 0 // + 1/3
2/5*z = 1/3 // : 2/5
z = 1/3/2/5
z = 5/6
z = 5/6
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