21-x=x-4

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Solution for 21-x=x-4 equation:


Simplifying
21 + -1x = x + -4

Reorder the terms:
21 + -1x = -4 + x

Solving
21 + -1x = -4 + 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.
21 + -1x + -1x = -4 + x + -1x

Combine like terms: -1x + -1x = -2x
21 + -2x = -4 + x + -1x

Combine like terms: x + -1x = 0
21 + -2x = -4 + 0
21 + -2x = -4

Add '-21' to each side of the equation.
21 + -21 + -2x = -4 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = -4 + -21
-2x = -4 + -21

Combine like terms: -4 + -21 = -25
-2x = -25

Divide each side by '-2'.
x = 12.5

Simplifying
x = 12.5

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