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z in (-oo:+oo)
(3/4)*(z-1) = (-2/3)*(z-2) // - (-2/3)*(z-2)
(3/4)*(z-1)-((-2/3)*(z-2)) = 0
(3/4)*(z-1)+(2/3)*(z-2) = 0
3/4*(z-1)+2/3*(z-2) = 0
3/4*(z-1)+2/3*(z-2) = 0
17/12*z-25/12 = 0
17/12*z-25/12 = 0
17/12*z-25/12 = 0 // + 25/12
17/12*z = 25/12 // : 17/12
z = 25/12/17/12
z = 25/17
z = 25/17
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