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x in (-oo:+oo)
2/5 = x/25 // - x/25
2/5-(x/25) = 0
2/5-1/25*x = 0 // - 2/5
-1/25*x = -2/5 // : -1/25
x = -2/5/(-1/25)
x = 10
x = 10
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