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x in (-oo:+oo)
2/7 = x/340 // - x/340
2/7-(x/340) = 0
2/7-1/340*x = 0 // - 2/7
-1/340*x = -2/7 // : -1/340
x = -2/7/(-1/340)
x = 680/7
x = 680/7
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