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