Assuming that non-leading numbers are exponents, the expression becomes12a^2b + 8a - 5a^2b + 2ab - 4ab^2 + 6ab - 2a - 3ab
= 7a^2b + 6a + 5ab - 4ab^2
= a*(7ab + 6 + 5b - 4b^2)
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12a2b + 6a = 6a(2ab + 1)
The answer is 672.
That is 27 x 9 = 243
189
A plus + a plus is a plus.