2(1-d) - (2d+1)

Since the 2 is outside the brackets, we remove the brackets and multiply BOTH variables with 2.

That gives you 2 -2d

Now,the negative sign is outside the brackets for the 2nd eqn.So we multiply both variables with the -ve sign.

That gives you -2d -1

Combining both you get 2-2d -2d -2

That leaves you with -4d.

Can you try for the next problem?