17x + 12 = 54 - 4x

Solution:
1. Start with the equation:
17x + 12 = 54 - 4x

2. Add 4x to both sides to get all x terms on one side:
17x + 4x + 12 = 54

3. Combine like terms:
21x + 12 = 54

4. Subtract 12 from both sides to isolate the term with x:
21x = 54 - 12

5. Simplify the right side:
21x = 42

6. Divide both sides by 21 to solve for x:
x = \frac{42}{21}

7. Simplify the fraction:
x = 2