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z in (-oo:+oo)
-((10/3)*z)-4/3 = -((-8*z)/3-(2/3)) // + (-8*z)/3-(2/3)
(-8*z)/3-((10/3)*z)-4/3-(2/3) = 0
(-10/3)*z+(-8*z)/3-4/3-2/3 = 0
-6*z-2 = 0 // + 2
-6*z = 2 // : -6
z = 2/(-6)
z = -1/3
z = -1/3
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