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a in (-oo:+oo)
3*a+6*a-(1/2)+1 = 0
3*a+6*a-1/2+1 = 0
9*a+1/2 = 0 // - 1/2
9*a = -1/2 // : 9
a = -1/2/9
a = -1/18
a = -1/18
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