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X in (-oo:+oo)
3/9 = X/21 // - X/21
3/9-(X/21) = 0
1/3-1/21*X = 0 // - 1/3
-1/21*X = -1/3 // : -1/21
X = -1/3/(-1/21)
X = 7
X = 7
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