Question 296844
3a - 2{3a-2[1-4(a)-4(-1)]+5}
3a - 2{3a -2[1 -4a +4] +5}
3a - 2{3a -2 +8a -8]+5  you made a mistake in this step

it should have been
3a -2{3a-2+8a-8+5} where the last five is part of the -2 factor
followed by
3a -6a +4 -16a +16 -10

You would save yourself a ton of headaches by simplifing as you 

3a - 2{3a-2[1-4(a)-4(-1)]+5}
3a -2{3a -2[1-4a+4]+5}
3a -2{3a-2[5-4a]+5}
3a-2{3a-10+8a+5}
3a-2{11a-5}
3a-22a+10=-19a+10