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x in (-oo:+oo)
26/247 = x/209 // - x/209
26/247-(x/209) = 0
2/19-1/209*x = 0 // - 2/19
-1/209*x = -2/19 // : -1/209
x = -2/19/(-1/209)
x = 22
x = 22
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