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x in (-oo:+oo)
5*x-(12/6) = x+9 // - x+9
5*x-x-(12/6)-9 = 0
5*x-x-9-2 = 0
4*x-11 = 0 // + 11
4*x = 11 // : 4
x = 11/4
x = 11/4
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