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a in (-oo:+oo)
(5/7)*a+1 = 8 // - 8
(5/7)*a-8+1 = 0
5/7*a-7 = 0 // + 7
5/7*a = 7 // : 5/7
a = 7/5/7
a = 49/5
a = 49/5
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