a-3 [a+3(a-3a+3)]-81= ?
a-3 [a+3(a-3a+3)]-81
= a - 3 [ a + 3 a - 9 a + 9] - 81
= a - 3 [ -5 a + 9 ] - 81
= a - (-15 a) - 27 - 81
= 16 a - 108
= a - 3 [ a + 3 a - 9 a + 9] - 81
= a - 3 [ -5 a + 9 ] - 81
= a - (-15 a) - 27 - 81
= 16 a - 108
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