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