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z in (-oo:+oo)
12 = (z+2)/(-6) // - (z+2)/(-6)
12-((z+2)/(-6)) = 0
(-1*(z+2))/(-6)+12 = 0
(-1*(z+2))/(-6)+(-6*12)/(-6) = 0
-1*(z+2)-6*12 = 0
-z-74 = 0
(-z-74)/(-6) = 0
(-z-74)/(-6) = 0 // * -6
-z-74 = 0
-z-74 = 0 // + 74
-z = 74 // * -1
z = -74
z = -74
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