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x in (-oo:+oo)
3/7 = x/8 // - x/8
3/7-(x/8) = 0
3/7-1/8*x = 0 // - 3/7
-1/8*x = -3/7 // : -1/8
x = -3/7/(-1/8)
x = 24/7
x = 24/7
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