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