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X in (-oo:+oo)
X/3-1 = 2*(X-8) // - 2*(X-8)
X/3-(2*(X-8))-1 = 0
X/3-2*(X-8)-1 = 0
(-2*3*(X-8))/3+X/3+(-1*3)/3 = 0
X-2*3*(X-8)-1*3 = 0
48-5*X-3 = 0
45-5*X = 0
(45-5*X)/3 = 0
(45-5*X)/3 = 0 // * 3
45-5*X = 0
45-5*X = 0 // - 45
-5*X = -45 // : -5
X = -45/(-5)
X = 9
X = 9
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