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z in (-oo:+oo)
(-1/9)*(z-4) = (1/6)*(z-3) // - (1/6)*(z-3)
(-1/9)*(z-4)-((1/6)*(z-3)) = 0
(-1/9)*(z-4)+(-1/6)*(z-3) = 0
-1/9*(z-4)-1/6*(z-3) = 0
-1/9*(z-4)-1/6*(z-3) = 0
17/18-5/18*z = 0
17/18-5/18*z = 0
17/18-5/18*z = 0 // - 17/18
-5/18*z = -17/18 // : -5/18
z = -17/18/(-5/18)
z = 17/5
z = 17/5
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