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x in (-oo:+oo)
15/33 = x/21 // - x/21
15/33-(x/21) = 0
5/11-1/21*x = 0 // - 5/11
-1/21*x = -5/11 // : -1/21
x = -5/11/(-1/21)
x = 105/11
x = 105/11
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