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a in (-oo:+oo)
(5/7)*a-(4/7)-1 = 0
(5/7)*a-4/7-1 = 0
5/7*a-11/7 = 0 // + 11/7
5/7*a = 11/7 // : 5/7
a = 11/7/5/7
a = 11/5
a = 11/5
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