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z in (-oo:+oo)
(2/3)*(z-(3/8)) = (3/4)*(z+3) // - (3/4)*(z+3)
(2/3)*(z-(3/8))-((3/4)*(z+3)) = 0
(2/3)*(z-3/8)+(-3/4)*(z+3) = 0
2/3*(z-3/8)-3/4*(z+3) = 0
2/3*(z-3/8)-3/4*(z+3) = 0
-1/12*z-5/2 = 0
-1/12*z-5/2 = 0
-1/12*z-5/2 = 0 // + 5/2
-1/12*z = 5/2 // : -1/12
z = 5/2/(-1/12)
z = -30
z = -30
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