Can someone please help me with this I really really need help please help me.

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

Which one ? is the answer and how to find this answer

What term makes it inconsistent y=2x - 4