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z in (-oo:+oo)
-8 = (-2/5)*z // - (-2/5)*z
-((-2/5)*z)-8 = 0
(2/5)*z-8 = 0
2/5*z-8 = 0 // + 8
2/5*z = 8 // : 2/5
z = 8/2/5
z = 20
z = 20
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