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x in (-oo:+oo)
X/3-x = 8 // - 8
X/3-x-8 = 0
1/3*X-x-8 = 0 // - 1/3*X-8
-x = -(1/3*X-8) // * -1
x = 1/3*X-8
x = 1/3*X-8
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