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z in (-oo:+oo)
25 = (5/4)*z // - (5/4)*z
25-((5/4)*z) = 0
(-5/4)*z+25 = 0
25-5/4*z = 0 // - 25
-5/4*z = -25 // : -5/4
z = -25/(-5/4)
z = 20
z = 20
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