21x-400=x

Solution for 21x-400=x equation:

Simplifying
21x + -400 = x

Reorder the terms:
-400 + 21x = x

Solving
-400 + 21x = x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x' to each side of the equation.
-400 + 21x + -1x = x + -1x

Combine like terms: 21x + -1x = 20x
-400 + 20x = x + -1x

Combine like terms: x + -1x = 0
-400 + 20x = 0

Add '400' to each side of the equation.
-400 + 400 + 20x = 0 + 400

Combine like terms: -400 + 400 = 0
0 + 20x = 0 + 400
20x = 0 + 400

Combine like terms: 0 + 400 = 400
20x = 400

Divide each side by '20'.
x = 20

Simplifying
x = 20