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X in (-oo:+oo)
1/8-(X/7) = 3/56 // - 3/56
1/8-(X/7)-(3/56) = 0
1/8-(X/7)-3/56 = 0
1/14-1/7*X = 0 // - 1/14
-1/7*X = -1/14 // : -1/7
X = -1/14/(-1/7)
X = 1/2
X = 1/2
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