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x in (-oo:+oo)
(1/2)*x-8 = 5*x-9 // - 5*x-9
(1/2)*x-(5*x)-8+9 = 0
(1/2)*x-5*x-8+9 = 0
1-9/2*x = 0 // - 1
-9/2*x = -1 // : -9/2
x = -1/(-9/2)
x = 2/9
x = 2/9
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