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a in (-oo:+oo)
((1/3)/8)*a+1/4 = 7/8 // - 7/8
((1/3)/8)*a+1/4-(7/8) = 0
((1/3)/8)*a+1/4-7/8 = 0
1/24*a-5/8 = 0 // + 5/8
1/24*a = 5/8 // : 1/24
a = 5/8/1/24
a = 15
a = 15
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