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a in (-oo:+oo)
17/24 = 6*a-((1/6)*a)+1/8 // - 6*a-((1/6)*a)+1/8
(1/6)*a-(6*a)+17/24-(1/8) = 0
(1/6)*a-6*a+17/24-1/8 = 0
7/12-35/6*a = 0 // - 7/12
-35/6*a = -7/12 // : -35/6
a = -7/12/(-35/6)
a = 1/10
a = 1/10
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