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x in (-oo:+oo)
16/10 = x/25 // - x/25
16/10-(x/25) = 0
8/5-1/25*x = 0 // - 8/5
-1/25*x = -8/5 // : -1/25
x = -8/5/(-1/25)
x = 40
x = 40
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