Warning: The following guide may cause excessive eye strain, keyboard fatigue, and an unquenchable thirst for more complex solutions.
You must first write the equation you seek to solve. In this case, it's a classic: x = 3y + 2z - 4
Yes, you heard that right: multiply both sides by 4. Don't ask questions. 4x = 12y + 8z - 16
Because, mathematically speaking, this is exactly what you needed to do. 4x + 5 = 12y + 8z - 11
Take it to the next level: Add 7 to both sides!
Congratulations, you've solved for x in the most unnecessary way possible! x = (12y + 8z - 11) / 4