Answer:
Step-by-step explanation:
Step 1: Flip the equation.
Step 2: Subtract D from both sides.
Step 3: Divide both sides by Dr.
Answer:
B
Step-by-step explanation:
Six million, seven thousand and two hundred.

From there we can see that because x equals both to a and b, it must be that a = b.
It the answer would be 51.41