Answer :

Let's solve this step by step:

1. Identify the expressions:
- We are given [tex]\(3x\)[/tex] and [tex]\(y\)[/tex].

2. Substitute the given values:
- Let [tex]\(x = 3\)[/tex] and [tex]\(y = 1\)[/tex].

3. Calculate [tex]\(3x\)[/tex]:
- [tex]\(3x = 3 \cdot 3 = 9\)[/tex].

4. Calculate the difference [tex]\(3x - y\)[/tex]:
- [tex]\(9 - 1 = 8\)[/tex].

5. Calculate seven times the difference:
- [tex]\(7 \cdot 8 = 56\)[/tex].

Therefore, seven times the difference of [tex]\(3x\)[/tex] and [tex]\(y\)[/tex] is [tex]\(56\)[/tex].