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