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z in (-oo:+oo)
5/12 = (-1/(-2))*z // - (-1/(-2))*z
5/12-((-1/(-2))*z) = 0
(-1/2)*z+5/12 = 0
5/12-1/2*z = 0 // - 5/12
-1/2*z = -5/12 // : -1/2
z = -5/12/(-1/2)
z = 5/6
z = 5/6
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