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a in (-oo:+oo)
7*a+5*a-(3/8) = 151/24 // - 151/24
7*a+5*a-(3/8)-(151/24) = 0
7*a+5*a-3/8-151/24 = 0
12*a-20/3 = 0 // + 20/3
12*a = 20/3 // : 12
a = 20/3/12
a = 5/9
a = 5/9
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