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X in (-oo:+oo)
X/8-(1/2) = 10 // - 10
X/8-(1/2)-10 = 0
X/8-1/2-10 = 0
1/8*X-21/2 = 0 // + 21/2
1/8*X = 21/2 // : 1/8
X = 21/2/1/8
X = 84
X = 84
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