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z in (-oo:+oo)
2/3-((5/4)*z) = 5/6 // - 5/6
2/3-((5/4)*z)-(5/6) = 0
(-5/4)*z+2/3-5/6 = 0
-5/4*z-1/6 = 0 // + 1/6
-5/4*z = 1/6 // : -5/4
z = 1/6/(-5/4)
z = -2/15
z = -2/15
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