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a in (-oo:+oo)
-6*a-(2/9) = -29/9 // + -29/9
-6*a-(2/9)-(-29/9) = 0
29/9-6*a-2/9 = 0
3-6*a = 0 // - 3
-6*a = -3 // : -6
a = -3/(-6)
a = 1/2
a = 1/2
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