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x in (-oo:+oo)
x/9 = 3/7 // - 3/7
x/9-(3/7) = 0
x/9-3/7 = 0
1/9*x-3/7 = 0 // + 3/7
1/9*x = 3/7 // : 1/9
x = 3/7/1/9
x = 27/7
x = 27/7
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