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Z in (-oo:+oo)
(2.5-Z)/(2.5-1) = 0.33 // - 0.33
(2.5-Z)/(2.5-1)-0.33 = 0
(2.5-Z)/1.5-0.33 = 0
(2.5-Z)/1.5+(-0.33*1.5)/1.5 = 0
2.5-Z-0.33*1.5 = 0
2.005-Z = 0
(2.005-Z)/1.5 = 0
(2.005-Z)/1.5 = 0 // * 1.5
2.005-Z = 0
2.005-Z = 0 // - 2.005
-Z = -2.005 // * -1
Z = 2.005
Z = 2.005
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