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x in (-oo:+oo)
7*x = 9/11 // - 9/11
7*x-(9/11) = 0
7*x-9/11 = 0
7*x-9/11 = 0 // + 9/11
7*x = 9/11 // : 7
x = 9/11/7
x = 9/77
x = 9/77
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