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z in (-oo:+oo)
(4/5)*(z-5) = (-2/3)*(z-3) // - (-2/3)*(z-3)
(4/5)*(z-5)-((-2/3)*(z-3)) = 0
(4/5)*(z-5)+(2/3)*(z-3) = 0
4/5*(z-5)+2/3*(z-3) = 0
4/5*(z-5)+2/3*(z-3) = 0
22/15*z-6 = 0
22/15*z-6 = 0
22/15*z-6 = 0 // + 6
22/15*z = 6 // : 22/15
z = 6/22/15
z = 45/11
z = 45/11
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