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Z in (-oo:+oo)
(Z-2000)/(7000-2000) = 0.4 // - 0.4
(Z-2000)/(7000-2000)-0.4 = 0
(Z-2000)/5000-0.4 = 0
(Z-2000)/5000+(-0.4*5000)/5000 = 0
Z-0.4*5000-2000 = 0
Z-4000 = 0
(Z-4000)/5000 = 0
(Z-4000)/5000 = 0 // * 5000
Z-4000 = 0
Z-4000 = 0 // + 4000
Z = 4000
Z = 4000
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