Solve each given equation and show your work. Tell whether it has one solution, an infinite number of solutions, or no solutions, and identify each equation as an identity, a contradiction, or neither.
(A) 6x + 5x – 4 = 24 + 9x
(B) 25 - 3x = 15 – 3x +10
(C) 4x + 8 = 2x + 7 +x - 20