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z in (-oo:+oo)
(1/5)*(z+2) = (2/3)*(z-1) // - (2/3)*(z-1)
(1/5)*(z+2)-((2/3)*(z-1)) = 0
(1/5)*(z+2)+(-2/3)*(z-1) = 0
1/5*(z+2)-2/3*(z-1) = 0
1/5*(z+2)-2/3*(z-1) = 0
16/15-7/15*z = 0
16/15-7/15*z = 0
16/15-7/15*z = 0 // - 16/15
-7/15*z = -16/15 // : -7/15
z = -16/15/(-7/15)
z = 16/7
z = 16/7
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