WHOEVER ANSWERS FIRST GETS BRAINLIEST AND I NEED AN EXPLANATION PLZ

Answer:
Q7: -4 ; Q8: 2.6x + 8
Step-by-step explanation:
For the first one, since they are like terms, you can just normally subtract:
3x - 7x = -4x
Its a negative since 3 - 7 = -4 not positive 4.
You did question 8 correctly.