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x in (-oo:+oo)
(1/2)*x+9 = 23/2 // - 23/2
(1/2)*x-(23/2)+9 = 0
(1/2)*x-23/2+9 = 0
1/2*x-5/2 = 0 // + 5/2
1/2*x = 5/2 // : 1/2
x = 5/2/1/2
x = 5
x = 5
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