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x in (-oo:+oo)
x/4-(x/2) = 9-x // - 9-x
x/4-(x/2)+x-9 = 0
3/4*x-9 = 0 // + 9
3/4*x = 9 // : 3/4
x = 9/3/4
x = 12
x = 12
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