I NEED HELP PLEASE SHOW THE WORK TOO

Answer:
x = 39
Step-by-step explanation:
Step 1: Since A and B are congruent, solve for x
2x - 3 + 3 - 3x = 3x - 42 + 3 - 3x
-x / -1 = -39 / -1
x = 39
Answer: x = 39