x+[-21]=8

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Solution for x+[-21]=8 equation: 


Simplifying
x + [-21] = 8
x + -21 = 8

Reorder the terms:
-21 + x = 8

Solving
-21 + x = 8

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 = 8 + 21

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

Combine like terms: 8 + 21 = 29
x = 29

Simplifying
x = 29

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