Answer:

Explanation:
Now we have to,
→ Find the required value of x.
The equation is,
→ 4x + 9 - 3x - 15 = 45
Then the value of x will be,
→ 4x + 9 - 3x - 15 = 45
→ (4x - 3x) + (9 - 15) = 45
→ (x) + (-6) = 45
→ x - 6 = 45
→ x = 45 + 6
→ [ x = 51 ]
Hence, the value of x is 51.