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z in (-oo:+oo)
(1/8)*(z-5) = (-3/8)*(z+1) // - (-3/8)*(z+1)
(1/8)*(z-5)-((-3/8)*(z+1)) = 0
(1/8)*(z-5)+(3/8)*(z+1) = 0
1/8*(z-5)+3/8*(z+1) = 0
1/8*(z-5)+3/8*(z+1) = 0
1/2*z-1/4 = 0
1/2*z-1/4 = 0
1/2*z-1/4 = 0 // + 1/4
1/2*z = 1/4 // : 1/2
z = 1/4/1/2
z = 1/2
z = 1/2
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