Answer:
X = 3
Step-by-step explanation:
3x + 4x - 12 = - 10x + 30 + 9
7x - 12 = - 10x + 39
7x + 10x = 12 + 39
17x = 51
x = 3
Combine like terms
-6x² + (-x²) = -6x² - x² = -7x²
-7x² + 15x + 4 is your answer
hope this helps
I think that the answer is D
