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x in (-oo:+oo)
16/17 = x/40 // - x/40
16/17-(x/40) = 0
16/17-1/40*x = 0 // - 16/17
-1/40*x = -16/17 // : -1/40
x = -16/17/(-1/40)
x = 640/17
x = 640/17
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