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x in (-oo:+oo)
(5/4)/20 = x/16 // - x/16
(5/4)/20-(x/16) = 0
1/16-1/16*x = 0 // - 1/16
-1/16*x = -1/16 // : -1/16
x = -1/16/(-1/16)
x = 1
x = 1
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