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z in (-oo:+oo)
12 = (3*z)/(-6) // - (3*z)/(-6)
12-((3*z)/(-6)) = 0
(1/2)*z+12 = 0
1/2*z+12 = 0 // - 12
1/2*z = -12 // : 1/2
z = -12/1/2
z = -24
z = -24
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