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a in (-oo:+oo)
a/7 = 11/7 // - 11/7
a/7-(11/7) = 0
a/7-11/7 = 0
1/7*a-11/7 = 0 // + 11/7
1/7*a = 11/7 // : 1/7
a = 11/7/1/7
a = 11
a = 11
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