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