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Z in (-oo:+oo)
-2*Z = -2/15-(2/3) // + -2/15-(2/3)
2/3-2*Z-(-2/15) = 0
2/15-2*Z+2/3 = 0
4/5-2*Z = 0 // - 4/5
-2*Z = -4/5 // : -2
Z = -4/5/(-2)
Z = 2/5
Z = 2/5
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