Correct Answer: 24
Explanation:
⟹ 10x2 + 8 + 18x = 80 + x2
⟹ 9x2 + 18x - 72 = 0
⟹ x2 + 2x - 8 = 0
⟹ (x + 4)(x - 2) = 0
⟹ x = 2.