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z in (-oo:+oo)
-6 = z/4-3 // - z/4-3
3-(z/4)-6 = 0
-1/4*z-3 = 0 // + 3
-1/4*z = 3 // : -1/4
z = 3/(-1/4)
z = -12
z = -12
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