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x in (-oo:+oo)
80/89 = x/10407 // - x/10407
80/89-(x/10407) = 0
80/89-1/10407*x = 0 // - 80/89
-1/10407*x = -80/89 // : -1/10407
x = -80/89/(-1/10407)
x = 832560/89
x = 832560/89
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