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z in (-oo:+oo)
-((1/3)*z)-3/4 = 1/4 // - 1/4
-((1/3)*z)-3/4-(1/4) = 0
(-1/3)*z-3/4-1/4 = 0
-1/3*z-1 = 0 // + 1
-1/3*z = 1 // : -1/3
z = 1/(-1/3)
z = -3
z = -3
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