Question

3 times sum of a number and nine is 12

Answer 1

-5 is the missing number.

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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