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a in (-oo:+oo)
(7*a+1)/2 = 8 // - 8
(7*a+1)/2-8 = 0
(7*a+1)/2+(-8*2)/2 = 0
7*a-8*2+1 = 0
7*a-15 = 0
(7*a-15)/2 = 0
(7*a-15)/2 = 0 // * 2
7*a-15 = 0
7*a-15 = 0 // + 15
7*a = 15 // : 7
a = 15/7
a = 15/7
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