Given

Collecting the like terms


The coefficient of

is 10
The constant is 3
Each one is multiplying by 6
So 7 x 6 = 42
Answer:
42
Hello!
Let's subtract!
⇒ 6x² - 2x + 6 - (6x² - 7x - 2)
⇒ 6x² - 2x + 6 - 6x² + 7x + 2
⇒ 5x + 8
∴ The difference will be equal to 5x + 8.