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a in (-oo:+oo)
6*(3*a+6) = -126 // + 126
6*(3*a+6)+126 = 0
6*(3*a+6)+126 = 0
18*a+162 = 0
18*a+162 = 0
18*a+162 = 0 // - 162
18*a = -162 // : 18
a = -162/18
a = -9
a = -9
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