21-x=14

To solve the equation 21-x=14, we need to isolate x on one side of the equation.

First, let's simplify the equation by subtracting 14 from both sides:

21 - 14 - x = 14 - 14 7 - x = 0

Next, to isolate x, we can subtract 7 from both sides:

7 - x - 7 = 0 - 7 -x = -7

Finally, to solve for x, we multiply both sides by -1 to get the value of x:

(-1) * (-x) = (-1) * (-7) x = 7

So the solution to the equation is x = 7.