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z in (-oo:+oo)
-8 = (-4/5)*z // - (-4/5)*z
-((-4/5)*z)-8 = 0
(4/5)*z-8 = 0
4/5*z-8 = 0 // + 8
4/5*z = 8 // : 4/5
z = 8/4/5
z = 10
z = 10
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