This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
3a- { 4a + 3 [2a - 2 ( 2a + 3b ) - ( a-b ) - 6 ( a + b)]}

First, distribute the coefficients ng mga parenthesis:
3a- { 4a + 3 [2a -4a -6b -a+b -6a -6b]}

The, combine similar terms sa loob ng bracket:
3a- { 4a + 3 [-9a -11b]}

Distribute 3 sa loob ng bracket:
3a- {4a -27a -33b}

Distribute negative sign sa loob ng braces:
3a -4a +27a +33b

Combine similar terms:
30a +29b          ––FINAL ANSWER