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a in (-oo:+oo)
1/2-(6*a) = -59/2 // + -59/2
1/2-(6*a)-(-59/2) = 0
1/2-6*a+59/2 = 0
30-6*a = 0 // - 30
-6*a = -30 // : -6
a = -30/(-6)
a = 5
a = 5
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