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x in (-oo:+oo)
x-((1/2)*x)-9 = -5 // + 5
x-((1/2)*x)-9+5 = 0
x+(-1/2)*x-9+5 = 0
1/2*x-4 = 0 // + 4
1/2*x = 4 // : 1/2
x = 4/1/2
x = 8
x = 8
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