Answer:
-5 is the missing number.
Step-by-step explanation:
Let's write the equation.
Represent the number with x.
3( x + 9 ) = 12
Now, we solve for x.
Divide by 3 on both sides.
x + 9 = 4
Now, subtract by 9 on both sides.
x = -5
The number is -5.
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