13+x=21

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Solution for 13+x=21 equation: 


Simplifying
13 + x = 21

Solving
13 + x = 21

Solving for variable 'x'.

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

Add '-13' to each side of the equation.
13 + -13 + x = 21 + -13

Combine like terms: 13 + -13 = 0
0 + x = 21 + -13
x = 21 + -13

Combine like terms: 21 + -13 = 8
x = 8

Simplifying
x = 8

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