A= 1 + (2-x)
= 1 + 2 - x
= 3 - x
B = (2x -4) + (5x-6)
= 2x - 4 + 5x - 6
= 7x - 10
C = 2,6x + (4-7x)
= 2,6x + 4 - 7x
= - 4,4 x + 4
D = (7-3x) + (2,4x - 5)
= 7 - 3x + 2,4x - 5
= 2 - 0,6x
E = 5 + (2x+3)
= 5 + 2x + 3
= 5 + 2x
F = 5x - (3-4x)
= 5x - 3 +4x
= 9x - 3
G = (x-4) -6
= x-4 -6
= x - 10
H = - ( -3x - 1 ) + (x-3)
= 3x + 1 + x - 3
= 4x - 2