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