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x in (-oo:+oo)
1/3 = x/25 // - x/25
1/3-(x/25) = 0
1/3-1/25*x = 0 // - 1/3
-1/25*x = -1/3 // : -1/25
x = -1/3/(-1/25)
x = 25/3
x = 25/3
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