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a in (-oo:+oo)
3-(3*a) = 3*a-27 // - 3*a-27
3-(3*a)-(3*a)+27 = 0
3-3*a-3*a+27 = 0
30-6*a = 0 // - 30
-6*a = -30 // : -6
a = -30/(-6)
a = 5
a = 5
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