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z in (-oo:+oo)
(-5/4)*z+3 = -1/8 // + -1/8
(-5/4)*z-(-1/8)+3 = 0
(-5/4)*z+1/8+3 = 0
25/8-5/4*z = 0 // - 25/8
-5/4*z = -25/8 // : -5/4
z = -25/8/(-5/4)
z = 5/2
z = 5/2
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