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a in (-oo:+oo)
7*a+3/8 = 121/24 // - 121/24
7*a+3/8-(121/24) = 0
7*a+3/8-121/24 = 0
7*a-14/3 = 0 // + 14/3
7*a = 14/3 // : 7
a = 14/3/7
a = 2/3
a = 2/3
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