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a in (-oo:+oo)
9*a-(2/3)+1 = a-(2/6) // - a-(2/6)
9*a-a-(2/3)+2/6+1 = 0
9*a-a-2/3+2/6+1 = 0
8*a+2/3 = 0 // - 2/3
8*a = -2/3 // : 8
a = -2/3/8
a = -1/12
a = -1/12
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