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z in (-oo:+oo)
z/1.4 = 0.2 // - 0.2
z/1.4-0.2 = 0
0.71428571*z-0.2 = 0 // + 0.2
0.71428571*z = 0.2 // : 0.71428571
z = 0.2/0.71428571
z = 0.28
z = 0.28
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