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