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