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x in (-oo:+oo)
x-9 = (1/2)*x // - (1/2)*x
x-((1/2)*x)-9 = 0
x+(-1/2)*x-9 = 0
1/2*x-9 = 0 // + 9
1/2*x = 9 // : 1/2
x = 9/1/2
x = 18
x = 18
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