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Z in (-oo:+oo)
(4-Z)/(4-2) = 0.33 // - 0.33
(4-Z)/(4-2)-0.33 = 0
(4-Z)/2-0.33 = 0
(4-Z)/2+(-0.33*2)/2 = 0
4-Z-0.33*2 = 0
3.34-Z = 0
(3.34-Z)/2 = 0
(3.34-Z)/2 = 0 // * 2
3.34-Z = 0
3.34-Z = 0 // - 3.34
-Z = -3.34 // * -1
Z = 3.34
Z = 3.34
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