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a in (-oo:+oo)
2*(3*a+6) = 66 // - 66
2*(3*a+6)-66 = 0
2*(3*a+6)-66 = 0
6*a-54 = 0
6*a-54 = 0
6*a-54 = 0 // + 54
6*a = 54 // : 6
a = 54/6
a = 9
a = 9
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