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x in (-oo:+oo)
x/9 = 7/3 // - 7/3
x/9-(7/3) = 0
x/9-7/3 = 0
1/9*x-7/3 = 0 // + 7/3
1/9*x = 7/3 // : 1/9
x = 7/3/1/9
x = 21
x = 21
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