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z in (-oo:+oo)
-2.77 = z/4 // - z/4
-(z/4)-2.77 = 0
-1/4*z-2.77 = 0 // + 2.77
-1/4*z = 2.77 // : -1/4
z = 2.77/(-1/4)
z = -11.08
z = -11.08
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