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a in (-oo:+oo)
3/8-(7*a) = 3*a-(477/8) // - 3*a-(477/8)
3/8-(7*a)-(3*a)+477/8 = 0
3/8-7*a-3*a+477/8 = 0
60-10*a = 0 // - 60
-10*a = -60 // : -10
a = -60/(-10)
a = 6
a = 6
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