Answer:
be cautious of the answer
Step-by-step explanation:
Answer: M =
Step-by-step explanation:

M (x + y) + 4y = x + 2y (Multiply
in both sides)
M (x + y) = x + 2y - 4y
M (x + y) = x - 2y (Divide (x+y) from both sides)
M =
3 * 171 and you are going to get 513