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z in (-oo:+oo)
(54*(4-z))/4 = -z // + z
(54*(4-z))/4+z = 0
(54*(4-z))/4+(4*z)/4 = 0
54*(4-z)+4*z = 0
216-50*z = 0
(216-50*z)/4 = 0
(216-50*z)/4 = 0 // * 4
216-50*z = 0
216-50*z = 0 // - 216
-50*z = -216 // : -50
z = -216/(-50)
z = 108/25
z = 108/25
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