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x in (-oo:+oo)
(1/2)*x+9 = 2*x-6 // - 2*x-6
(1/2)*x-(2*x)+6+9 = 0
(1/2)*x-2*x+6+9 = 0
15-3/2*x = 0 // - 15
-3/2*x = -15 // : -3/2
x = -15/(-3/2)
x = 10
x = 10
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