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X in (-oo:+oo)
X/8+4 = 18 // - 18
X/8-18+4 = 0
1/8*X-18+4 = 0 // - 4-18
1/8*X = -(4-18) // : 1/8
X = (-(4-18))/1/8
X = 8*(18-4)
X = 8*(18-4)
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