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z in (-oo:+oo)
(-4/5)*(z-(1/2)) = (-1/2)*(z+3) // - (-1/2)*(z+3)
(-4/5)*(z-(1/2))-((-1/2)*(z+3)) = 0
(-4/5)*(z-1/2)+(1/2)*(z+3) = 0
1/2*(z+3)-4/5*(z-1/2) = 0
1/2*(z+3)-4/5*(z-1/2) = 0
19/10-3/10*z = 0
19/10-3/10*z = 0
19/10-3/10*z = 0 // - 19/10
-3/10*z = -19/10 // : -3/10
z = -19/10/(-3/10)
z = 19/3
z = 19/3
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