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z in (-oo:+oo)
5*z-((25/8)*z)-40 = 0
5*z+(-25/8)*z-40 = 0
15/8*z-40 = 0 // + 40
15/8*z = 40 // : 15/8
z = 40/15/8
z = 64/3
z = 64/3
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