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z in (-oo:+oo)
(1/3)*z-((1/2)*z) = 2-5 // - 2-5
(1/3)*z-((1/2)*z)-2+5 = 0
(1/3)*z+(-1/2)*z-2+5 = 0
3-1/6*z = 0 // - 3
-1/6*z = -3 // : -1/6
z = -3/(-1/6)
z = 18
z = 18
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