a) (x-2) - (2-x)=x-2 - 2 + x = 2x-4
b) (a+b)+(2a-b) - (a-2b)= a + b + 2a - b - a + 2b = 2a + 2b
c) (3x-y+1) - (x+y) + (y-x)= 3x - y + 1 - x - y + y - x = x -y + 1
d) -(2a²-3ab) - (2b-3a²) + (ab-b)= -2a² + 3ab - 2b + 3a² + ab - b = a² + 4ab - 3b
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a) (x-2) - (2-x)=x-2 - 2 + x = 2x-4
b) (a+b)+(2a-b) - (a-2b)= a + b + 2a - b - a + 2b = 2a + 2b
c) (3x-y+1) - (x+y) + (y-x)= 3x - y + 1 - x - y + y - x = x -y + 1
d) -(2a²-3ab) - (2b-3a²) + (ab-b)= -2a² + 3ab - 2b + 3a² + ab - b = a² + 4ab - 3b