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z in (-oo:+oo)
(1/2)*(8*z-10)-((2/3)*(9*z-6)) = -3 // + 3
(1/2)*(8*z-10)-((2/3)*(9*z-6))+3 = 0
(1/2)*(8*z-10)+(-2/3)*(9*z-6)+3 = 0
1/2*(8*z-10)-2/3*(9*z-6)+3 = 0
1/2*(8*z-10)-2/3*(9*z-6)+3 = 0
3-2*z-1 = 0
2-2*z = 0
2-2*z = 0
2-2*z = 0 // - 2
-2*z = -2 // : -2
z = -2/(-2)
z = 1
z = 1
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