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z in (-oo:+oo)
-(z/1.4) = 8.8 // - 8.8
-(z/1.4)-8.8 = 0
-0.71428571*z-8.8 = 0
-0.71428571*z-8.8 = 0 // + 8.8
-0.71428571*z = 8.8 // : -0.71428571
z = 8.8/(-0.71428571)
z = -12.32000007
z = -12.32000007
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