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z in (-oo:+oo)
(-1/5)*(z+1/6) = (1/9)*(z+4) // - (1/9)*(z+4)
(-1/5)*(z+1/6)-((1/9)*(z+4)) = 0
(-1/5)*(z+1/6)+(-1/9)*(z+4) = 0
-1/5*(z+1/6)-1/9*(z+4) = 0
-1/5*(z+1/6)-1/9*(z+4) = 0
-14/45*z-43/90 = 0
-14/45*z-43/90 = 0
-14/45*z-43/90 = 0 // + 43/90
-14/45*z = 43/90 // : -14/45
z = 43/90/(-14/45)
z = -43/28
z = -43/28
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