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x in (-oo:+oo)
3/1380 = x/2760 // - x/2760
3/1380-(x/2760) = 0
1/460-1/2760*x = 0 // - 1/460
-1/2760*x = -1/460 // : -1/2760
x = -1/460/(-1/2760)
x = 6
x = 6
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