4=x-21

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Solution for 4=x-21 equation:


Simplifying
4 = x + -21

Reorder the terms:
4 = -21 + x

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

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

Add '-4' to each side of the equation.
4 + -4 + -1x = -21 + -4

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

Combine like terms: -21 + -4 = -25
-1x = -25

Divide each side by '-1'.
x = 25

Simplifying
x = 25

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