a. 4 + (x - 3) * 5
4 + 5*x - 5*3
4 + 5x - 15
4 - 15 + 5x
-11 + 5x
b. 2*(x + 1) - x
2*x + 2x*1 - x
2x + 2x - x
5x
c. - (4 - x)*5
- (5*4 - 5*x)
- (20 - 5x)
-20 + 5x
d. 3*(5x*2) + 4
3*(10x) + 4
30x + 4
e. 3*x + x*2x + 3*4 + 2x*4
3x + 2x^2 + 12 + 8x
2x^2 + 3x + 8x + 12
2x^2 + 11x + 12