(1):2(4x-0.5)
=8x-1
(2):-3(1-1/6x)
=-3+1/2x
(3):-x+(2x-2)-(3x+5)
=-x+2x-2-3x-5
=-2x-7
(4):3a²+a²-(2a²-2a)+(3a-a²)
=3a²+a²-2a²+2a+3a-a²
=a²+5a