If `3X + 9 = 15`, then `x + 12` =

Options

A. 12
B. 13
C. 14
D. 15

Answer

To solve the equation \(3X + 9 = 15\) and find the value of \(x + 12\), we can follow these steps:

### Step 1: Start with the given equation
We have the equation:
\[ 3x + 9 = 15 \]

### Step 2: Subtract 9 from both sides
To isolate the term with \(x\), we can subtract 9 from both sides of the equation:
\[ 3x + 9 - 9 = 15 - 9 \]
This simplifies to:
\[ 3x = 6 \]

### Step 3: Divide both sides by 3
Next, we divide both sides of the equation by 3 to solve for \(x\):
\[ \frac{3x}{3} = \frac{6}{3} \]
This simplifies to:
\[ x = 2 \]

### Step 4: Find \(x + 12\)
Now that we have the value of \(x\), we can find \(x + 12\):
\[ x + 12 = 2 + 12 \]
This simplifies to:
\[ x + 12 = 14 \]

### Final Answer
Thus, the value of \(x + 12\) is:
\[ \boxed{14} \]