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x in (-oo:+oo)
7*x = 5/11 // - 5/11
7*x-(5/11) = 0
7*x-5/11 = 0
7*x-5/11 = 0 // + 5/11
7*x = 5/11 // : 7
x = 5/11/7
x = 5/77
x = 5/77
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