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x in (-oo:+oo)
15/8 = 5*x // - 5*x
15/8-(5*x) = 0
15/8-5*x = 0
15/8-5*x = 0 // - 15/8
-5*x = -15/8 // : -5
x = -15/8/(-5)
x = 3/8
x = 3/8
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