Which equation could be used to find the value of x in the triangle below? (Hint: After you have combined like terms)
A12x + 20 = 180
B12x = 180
C12x – 20 = 180
D8x – 10 = 4x + 10
A12x + 20 = 180
B12x = 180
C12x – 20 = 180
D8x – 10 = 4x + 10