When a= 1, a 1 = a 0 = 1.

When a≠ 1 (cannot be 0, 0 is meaningless), a 1 ≠ A 0.

8a-2b+ 1=- 17，8a-2b=- 18，4a-b=-9

When x=- 1,12ax-3bx3-5 =-12a+3b-5.

On the whole,-12a+3b =-4× (4a-b) =-3× (-9) = 27?

27-5=22

For reference only? Welcome to adoption? I hope it helps you? Remember adoption? :-D