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x in (-oo:+oo)
x/5-(x/3) = -15 // + 15
x/5-(x/3)+15 = 0
15-2/15*x = 0 // - 15
-2/15*x = -15 // : -2/15
x = -15/(-2/15)
x = 225/2
x = 225/2
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