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z in (-oo:+oo)
55-(6*((1/2)*z-8)) = 0
55-6*((1/2)*z-8) = 0
55-6*(1/2*z-8) = 0
55-6*(1/2*z-8) = 0
103-3*z = 0
103-3*z = 0
103-3*z = 0 // - 103
-3*z = -103 // : -3
z = -103/(-3)
z = 103/3
z = 103/3
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