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X in (-oo:+oo)
6/8 = X/28 // - X/28
6/8-(X/28) = 0
3/4-1/28*X = 0 // - 3/4
-1/28*X = -3/4 // : -1/28
X = -3/4/(-1/28)
X = 21
X = 21
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