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x in (-oo:+oo)
x/3+3/9 = 7/9 // - 7/9
x/3+3/9-(7/9) = 0
x/3+3/9-7/9 = 0
1/3*x-4/9 = 0 // + 4/9
1/3*x = 4/9 // : 1/3
x = 4/9/1/3
x = 4/3
x = 4/3
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