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z in (-oo:+oo)
-0.7 = (7/9)*z // - (7/9)*z
-((7/9)*z)-0.7 = 0
(-7/9)*z-0.7 = 0
-7/9*z-0.7 = 0 // + 0.7
-7/9*z = 0.7 // : -7/9
z = 0.7/(-7/9)
z = -0.9
z = -0.9
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