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X in (-oo:+oo)
4/8 = X/7 // - X/7
4/8-(X/7) = 0
1/2-1/7*X = 0 // - 1/2
-1/7*X = -1/2 // : -1/7
X = -1/2/(-1/7)
X = 7/2
X = 7/2
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