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x in (-oo:+oo)
9-x = (1/2)*x+8 // - (1/2)*x+8
9-x-((1/2)*x)-8 = 0
(-1/2)*x-x-8+9 = 0
1-3/2*x = 0 // - 1
-3/2*x = -1 // : -3/2
x = -1/(-3/2)
x = 2/3
x = 2/3
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