A = 3x + 1/4 - (3 - 2x)
A = 3x + 0,25 - 3 + 2x
A = 5x - 2,75
B = (7- 3x)(9x + 3)
B = 63x + 21 - 27x² - 9x
B = - 27x² + 54x + 21
C = (5z - 7)(8z + 2)
C = 40z² + 10z - 42z - 14
C = 40z² - 32z - 14
D = - 6x -18
D = -6(x + 3)
E = 9x + 6
E = 3(3x + 2)
F = 42 - 14x
F = -14(x - 3)