Remark
I take it MO is bisected by N. If it isn't we need some clue how to proceed.
Step One
Solve for x
9x = 2(x + 7) remove the brackets.
9x = 2x + 14 Subtract 2x from both sides.
9x - 2x = 14
7x = 14 Divide by 7
x = 14/7
x = 2
Step Two
Find MO
2(x + 7) + 9x = MO
2(2 + 7) + 9(2) = MO
2*9 + 9*2 = MO
18 + 18 = MO
36 = MO <<<<< Answer
