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x in (-oo:+oo)
5/8 = 15*x // - 15*x
5/8-(15*x) = 0
5/8-15*x = 0
5/8-15*x = 0 // - 5/8
-15*x = -5/8 // : -15
x = -5/8/(-15)
x = 1/24
x = 1/24
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