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z in (-oo:+oo)
(1/6)*(z-4) = (1/2)*(z+5) // - (1/2)*(z+5)
(1/6)*(z-4)-((1/2)*(z+5)) = 0
(1/6)*(z-4)+(-1/2)*(z+5) = 0
1/6*(z-4)-1/2*(z+5) = 0
1/6*(z-4)-1/2*(z+5) = 0
-1/3*z-19/6 = 0
-1/3*z-19/6 = 0
-1/3*z-19/6 = 0 // + 19/6
-1/3*z = 19/6 // : -1/3
z = 19/6/(-1/3)
z = -19/2
z = -19/2
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