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z in (-oo:+oo)
(3/8)*(z+4/5) = (-4/5)*(z+3/4) // - (-4/5)*(z+3/4)
(3/8)*(z+4/5)-((-4/5)*(z+3/4)) = 0
(3/8)*(z+4/5)+(4/5)*(z+3/4) = 0
3/8*(z+4/5)+4/5*(z+3/4) = 0
3/8*(z+4/5)+4/5*(z+3/4) = 0
47/40*z+9/10 = 0
47/40*z+9/10 = 0
47/40*z+9/10 = 0 // - 9/10
47/40*z = -9/10 // : 47/40
z = -9/10/47/40
z = -36/47
z = -36/47
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