21+x=25

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Solution for 21+x=25 equation: 


Simplifying
21 + x = 25

Solving
21 + x = 25

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + x = 25 + -21

Combine like terms: 21 + -21 = 0
0 + x = 25 + -21
x = 25 + -21

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

Simplifying
x = 4

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