4 + 5 + 3 - 4
So we can break it up a little bit.
4 + 5 = 9
So now the equation equals:
4 + 5 + 3 - 4 = 9 + 3 - 4
Now think about adding the 3:
So, 9 + 3 = 12
And so now the equation becomes:
9 + 3 - 4 = 12 - 4
And since, 12 - 4 = 8 the equation becomes:
4 + 5 + 3 - 4 = 8