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Z in (-oo:+oo)
(2.5-Z)/(2.5-1) = 0.07 // - 0.07
(2.5-Z)/(2.5-1)-0.07 = 0
(2.5-Z)/1.5-0.07 = 0
(2.5-Z)/1.5+(-0.07*1.5)/1.5 = 0
2.5-Z-0.07*1.5 = 0
2.395-Z = 0
(2.395-Z)/1.5 = 0
(2.395-Z)/1.5 = 0 // * 1.5
2.395-Z = 0
2.395-Z = 0 // - 2.395
-Z = -2.395 // * -1
Z = 2.395
Z = 2.395
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