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a in (-oo:+oo)
(7/2)*a-(5/4) = 1/8 // - 1/8
(7/2)*a-(5/4)-(1/8) = 0
(7/2)*a-5/4-1/8 = 0
7/2*a-11/8 = 0 // + 11/8
7/2*a = 11/8 // : 7/2
a = 11/8/7/2
a = 11/28
a = 11/28
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