We can do this by adding the given numbers and setting the sum equal to M.
6 + 1 - 4 - 9 + 9 - M - 6 = M
Now, let's simplify the equation:
-3 - M = M
Now, let's solve for M:
-3 = 2M
M = -\frac{3}{2}
Now that we have the value of M, we can find the missing
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