Uthara has 6x-7 pairs of shoes while China has 2x+3 pairs of shoes. How many more pairs of shoes does Uthara have than China?

This is a binomial subtraction problem.

It can be written as:

(6x-7) - (2x+3)

Binomial subtraction problems require one to phrase the problem as addition by flipping the signs.

(6x-7) + (-2x-3)

Now we can simplify:

6x-7-2x-3

4x-7-3

4x-10

So the answer is 4x-10 more pairs of shoes than China.