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x in (-oo:+oo)
x/3+3 = 9-x // - 9-x
x/3+x-9+3 = 0
4/3*x-6 = 0 // + 6
4/3*x = 6 // : 4/3
x = 6/4/3
x = 9/2
x = 9/2
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