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z in (-oo:+oo)
-2/7 = (2/3)*z // - (2/3)*z
-((2/3)*z)-2/7 = 0
(-2/3)*z-2/7 = 0
-2/3*z-2/7 = 0 // + 2/7
-2/3*z = 2/7 // : -2/3
z = 2/7/(-2/3)
z = -3/7
z = -3/7
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