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a in (-oo:+oo)
3*(-(3*a)-3) = -108 // + 108
3*(-(3*a)-3)+108 = 0
3*(-3*a-3)+108 = 0
3*(-3*a-3)+108 = 0
99-9*a = 0
99-9*a = 0
99-9*a = 0 // - 99
-9*a = -99 // : -9
a = -99/(-9)
a = 11
a = 11
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