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