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a in (-oo:+oo)
(5/7)*a-8 = -219/28 // + -219/28
(5/7)*a-(-219/28)-8 = 0
(5/7)*a+219/28-8 = 0
5/7*a-5/28 = 0 // + 5/28
5/7*a = 5/28 // : 5/7
a = 5/28/5/7
a = 1/4
a = 1/4
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