8+x=21

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Solution for 8+x=21 equation: 


Simplifying
8 + x = 21

Solving
8 + x = 21

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + x = 21 + -8

Combine like terms: 8 + -8 = 0
0 + x = 21 + -8
x = 21 + -8

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

Simplifying
x = 13

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