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x in (-oo:+oo)
4/6 = x/15 // - x/15
4/6-(x/15) = 0
2/3-1/15*x = 0 // - 2/3
-1/15*x = -2/3 // : -1/15
x = -2/3/(-1/15)
x = 10
x = 10
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