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z in (-oo:+oo)
2 = (8/5)*z // - (8/5)*z
2-((8/5)*z) = 0
(-8/5)*z+2 = 0
2-8/5*z = 0 // - 2
-8/5*z = -2 // : -8/5
z = -2/(-8/5)
z = 5/4
z = 5/4
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