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x in (-oo:+oo)
15-(x/3) = x/2 // - x/2
15-(x/3)-(x/2) = 0
15-5/6*x = 0 // - 15
-5/6*x = -15 // : -5/6
x = -15/(-5/6)
x = 18
x = 18
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