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x in (-oo:+oo)
X/4-x-9 = 8 // - 8
X/4-x-9-8 = 0
1/4*X-x-17 = 0 // - 1/4*X-17
-x = -(1/4*X-17) // * -1
x = 1/4*X-17
x = 1/4*X-17
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