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a in (-oo:+oo)
(7*a)/8 = 2/5 // - 2/5
(7*a)/8-(2/5) = 0
(7*a)/8-2/5 = 0
7/8*a-2/5 = 0 // + 2/5
7/8*a = 2/5 // : 7/8
a = 2/5/7/8
a = 16/35
a = 16/35
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