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X in (-oo:+oo)
X/8-(1/2) = 7 // - 7
X/8-(1/2)-7 = 0
X/8-1/2-7 = 0
1/8*X-15/2 = 0 // + 15/2
1/8*X = 15/2 // : 1/8
X = 15/2/1/8
X = 60
X = 60
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