Answer:
Step-by-step explanation:
27 + D + 2A + C = 25 + D + B + C + A
subtract D, A, C on both sides
=> 27 + A = 25 + B
=> B = A + 2
3D + A + 29 = 2B + D + A + 27
=> 2D + 29 = 2B + 27
=> 2D = 2B + 27 - 29
=> D = B - 1
substitute:
27 + (B - 1) + 2(A + 2) + A = 2A + B + 30
substitute again:
2A + (A + 2) + 30 = 3A + 32
