x-8=21

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Solution for x-8=21 equation: 


Simplifying
x + -8 = 21

Reorder the terms:
-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 = 29
x = 29

Simplifying
x = 29

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