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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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