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x in (-oo:+oo)
8/15 = 12*x // - 12*x
8/15-(12*x) = 0
8/15-12*x = 0
8/15-12*x = 0 // - 8/15
-12*x = -8/15 // : -12
x = -8/15/(-12)
x = 2/45
x = 2/45
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