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a in (-oo:+oo)
7*a+1 = 26/5 // - 26/5
7*a-(26/5)+1 = 0
7*a-26/5+1 = 0
7*a-21/5 = 0 // + 21/5
7*a = 21/5 // : 7
a = 21/5/7
a = 3/5
a = 3/5
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