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a in (-oo:+oo)
10-(6*a) = 17/2 // - 17/2
10-(6*a)-(17/2) = 0
10-6*a-17/2 = 0
3/2-6*a = 0 // - 3/2
-6*a = -3/2 // : -6
a = -3/2/(-6)
a = 1/4
a = 1/4
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