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x in (-oo:+oo)
3/99 = x/15 // - x/15
3/99-(x/15) = 0
1/33-1/15*x = 0 // - 1/33
-1/15*x = -1/33 // : -1/15
x = -1/33/(-1/15)
x = 5/11
x = 5/11
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