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x in (-oo:+oo)
x/9-(2/3) = 7 // - 7
x/9-(2/3)-7 = 0
x/9-2/3-7 = 0
1/9*x-23/3 = 0 // + 23/3
1/9*x = 23/3 // : 1/9
x = 23/3/1/9
x = 69
x = 69
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