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a in (-oo:+oo)
6*(-(3*a)-9) = 162 // - 162
6*(-(3*a)-9)-162 = 0
6*(-3*a-9)-162 = 0
6*(-3*a-9)-162 = 0
-18*a-216 = 0
-18*a-216 = 0
-18*a-216 = 0 // + 216
-18*a = 216 // : -18
a = 216/(-18)
a = -12
a = -12
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