21+3=x

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Solution for 21+3=x equation:


Simplifying
21 + 3 = x

Combine like terms: 21 + 3 = 24
24 = x

Solving
24 = 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.
24 + -1x = x + -1x

Combine like terms: x + -1x = 0
24 + -1x = 0

Add '-24' to each side of the equation.
24 + -24 + -1x = 0 + -24

Combine like terms: 24 + -24 = 0
0 + -1x = 0 + -24
-1x = 0 + -24

Combine like terms: 0 + -24 = -24
-1x = -24

Divide each side by '-1'.
x = 24

Simplifying
x = 24

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