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a in (-oo:+oo)
(3/4)*a = 5/7 // - 5/7
(3/4)*a-(5/7) = 0
(3/4)*a-5/7 = 0
3/4*a-5/7 = 0 // + 5/7
3/4*a = 5/7 // : 3/4
a = 5/7/3/4
a = 20/21
a = 20/21
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