21-x=14

To solve the equation 21 - x = 14, you need to isolate the variable x. Here's how:

1. Start with the equation: 21 - x = 14.
2. To isolate x, you want to get rid of the 21 on the left side of the equation.
3. Subtract 21 from both sides of the equation: (21 - x) - 21 = 14 - 21. This simplifies to: -x = -7.
4. To solve for x, multiply both sides of the equation by -1 to get rid of the negative sign in front of x: (-1)(-x) = (-1)(-7). This simplifies to: x = 7.

Therefore, the solution to the equation is x = 7.