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a in (-oo:+oo)
2*(-(3*a)-6) = -18 // + 18
2*(-(3*a)-6)+18 = 0
2*(-3*a-6)+18 = 0
2*(-3*a-6)+18 = 0
6-6*a = 0
6-6*a = 0
6-6*a = 0 // - 6
-6*a = -6 // : -6
a = -6/(-6)
a = 1
a = 1
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