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z in (-oo:+oo)
12 = (2*z)/(-6) // - (2*z)/(-6)
12-((2*z)/(-6)) = 0
(1/3)*z+12 = 0
1/3*z+12 = 0 // - 12
1/3*z = -12 // : 1/3
z = -12/1/3
z = -36
z = -36
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