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x in (-oo:+oo)
1/560 = x/1400 // - x/1400
1/560-(x/1400) = 0
1/560-1/1400*x = 0 // - 1/560
-1/1400*x = -1/560 // : -1/1400
x = -1/560/(-1/1400)
x = 5/2
x = 5/2
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