The missing number is 186.
To solve this equation, we need to isolate the variable (the unknown number) on one side of the equation. To do this, we can simplify the left side of the equation by subtracting 10 from both sides:
10 - __ = -196 -__ = -206
Then, we can isolate the variable by multiplying both sides of the equation by -1:
__ = 206
Therefore, the missing number is 186.