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a in (-oo:+oo)
(5/7)*a = 55/7 // - 55/7
(5/7)*a-(55/7) = 0
(5/7)*a-55/7 = 0
5/7*a-55/7 = 0 // + 55/7
5/7*a = 55/7 // : 5/7
a = 55/7/5/7
a = 11
a = 11
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