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x in (-oo:+oo)
4/10 = x/6 // - x/6
4/10-(x/6) = 0
2/5-1/6*x = 0 // - 2/5
-1/6*x = -2/5 // : -1/6
x = -2/5/(-1/6)
x = 12/5
x = 12/5
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