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x in (-oo:+oo)
5/2.5 = 5*x // - 5*x
5/2.5-(5*x) = 0
5/2.5-5*x = 0
2-5*x = 0 // - 2
-5*x = -2 // : -5
x = -2/(-5)
x = 2/5
x = 2/5
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