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x in (-oo:+oo)
4/10 = x/8 // - x/8
4/10-(x/8) = 0
2/5-1/8*x = 0 // - 2/5
-1/8*x = -2/5 // : -1/8
x = -2/5/(-1/8)
x = 16/5
x = 16/5
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