Translate: Seven increased by a number added to twice the difference between the number and two.

Let the number  = x

So 7 increased by a number = 7 + x

And the difference berween the number and 2 = (x - 2)   ...so twice this difference  = 2(x - 2)

And these two things added together =

(7 + x) + 2(x - 2)

So 'b" is the correct answer