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a in (-oo:+oo)
(27/9)*a = 3/7 // - 3/7
(27/9)*a-(3/7) = 0
(27/9)*a-3/7 = 0
3*a-3/7 = 0 // + 3/7
3*a = 3/7 // : 3
a = 3/7/3
a = 1/7
a = 1/7
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