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a in (-oo:+oo)
3*(6*a+6) = 54 // - 54
3*(6*a+6)-54 = 0
3*(6*a+6)-54 = 0
18*a-36 = 0
18*a-36 = 0
18*a-36 = 0 // + 36
18*a = 36 // : 18
a = 36/18
a = 2
a = 2
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