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x in (-oo:+oo)
4/15 = x/6 // - x/6
4/15-(x/6) = 0
4/15-1/6*x = 0 // - 4/15
-1/6*x = -4/15 // : -1/6
x = -4/15/(-1/6)
x = 8/5
x = 8/5
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