Subtract.

14x-(6+7x)

(simplify answer)

14x-(6+7x)
=14x-6-7x
=14x-7x-6
=(14x-7x)-6
=7x-6x

We can simplify an expression by distributing if needed and combing terms if needed.

In the expression 14x - 6 + 7x the terms 14x and 7x are like terms. Because they both have the same variable and are to the same power.

14x - 6 + 7x
21x - 6

So, 21x - 6 is the answer.

Iam guessing c. or d.