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a in (-oo:+oo)
(2/7)*a = 2/11 // - 2/11
(2/7)*a-(2/11) = 0
(2/7)*a-2/11 = 0
2/7*a-2/11 = 0 // + 2/11
2/7*a = 2/11 // : 2/7
a = 2/11/2/7
a = 7/11
a = 7/11
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