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a in (-oo:+oo)
83/12 = 7*a+a+1/4 // - 7*a+a+1/4
83/12-(7*a)-a-(1/4) = 0
83/12-7*a-a-1/4 = 0
20/3-8*a = 0 // - 20/3
-8*a = -20/3 // : -8
a = -20/3/(-8)
a = 5/6
a = 5/6
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