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z in (-oo:+oo)
40 = (-5/8)*z // - (-5/8)*z
40-((-5/8)*z) = 0
(5/8)*z+40 = 0
5/8*z+40 = 0 // - 40
5/8*z = -40 // : 5/8
z = -40/5/8
z = -64
z = -64
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