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z in (-oo:+oo)
-3 = z/6+12 // - z/6+12
-(z/6)-12-3 = 0
-1/6*z-15 = 0 // + 15
-1/6*z = 15 // : -1/6
z = 15/(-1/6)
z = -90
z = -90
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