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