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z in (-oo:+oo)
(-3/8)*(z-5) = (-3/4)*(z-(1/5)) // - (-3/4)*(z-(1/5))
(-3/8)*(z-5)-((-3/4)*(z-(1/5))) = 0
(-3/8)*(z-5)+(3/4)*(z-1/5) = 0
3/4*(z-1/5)-3/8*(z-5) = 0
3/4*(z-1/5)-3/8*(z-5) = 0
3/8*z+69/40 = 0
3/8*z+69/40 = 0
3/8*z+69/40 = 0 // - 69/40
3/8*z = -69/40 // : 3/8
z = -69/40/3/8
z = -23/5
z = -23/5
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