2a-{b-[3a+(4ab-3b)]-a}-2(b-ab)
=2a-{b-[3a+4ab-3b]-a}-2b+2ab
=2a-{b-3a-4ab+3b-a}-2b+2ab
=2a-{4b-4a-4ab}-2b+2ab
=2a-4b+4a+4ab-2b+2ab
=6a-6b+2ab
=6(a-b)+2ab
=6*5+2*(-1)
=28
2a-{b-[3a+(4ab-3b)]-a}-2(b-ab)
=2a-{b-[3a+4ab-3b]-a}-2b+2ab
=2a-{b-3a-4ab+3b-a}-2b+2ab
=2a-{4b-4a-4ab}-2b+2ab
=2a-4b+4a+4ab-2b+2ab
=6a-6b+2ab
=6(a-b)+2ab
=6*5+2*(-1)
=28