21+x=40

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Solution for 21+x=40 equation: 


Simplifying
21 + x = 40

Solving
21 + x = 40

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 = 40 + -21

Combine like terms: 21 + -21 = 0
0 + x = 40 + -21
x = 40 + -21

Combine like terms: 40 + -21 = 19
x = 19

Simplifying
x = 19

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