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z in (-oo:+oo)
(1/9)*(z+4) = (-3/8)*(z-2) // - (-3/8)*(z-2)
(1/9)*(z+4)-((-3/8)*(z-2)) = 0
(1/9)*(z+4)+(3/8)*(z-2) = 0
1/9*(z+4)+3/8*(z-2) = 0
1/9*(z+4)+3/8*(z-2) = 0
35/72*z-11/36 = 0
35/72*z-11/36 = 0
35/72*z-11/36 = 0 // + 11/36
35/72*z = 11/36 // : 35/72
z = 11/36/35/72
z = 22/35
z = 22/35
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