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a in (-oo:+oo)
(5/7)*a+1 = 53/63 // - 53/63
(5/7)*a-(53/63)+1 = 0
(5/7)*a-53/63+1 = 0
5/7*a+10/63 = 0 // - 10/63
5/7*a = -10/63 // : 5/7
a = -10/63/5/7
a = -2/9
a = -2/9
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