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x in (-oo:+oo)
5/3 = x/15 // - x/15
5/3-(x/15) = 0
5/3-1/15*x = 0 // - 5/3
-1/15*x = -5/3 // : -1/15
x = -5/3/(-1/15)
x = 25
x = 25
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