[x-9]=21

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Solution for [x-9]=21 equation: 


Simplifying
[x + -9] = 21

Reorder the terms:
[-9 + x] = 21

Remove brackets around [-9 + x]
-9 + x = 21

Solving
-9 + x = 21

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + x = 21 + 9
x = 21 + 9

Combine like terms: 21 + 9 = 30
x = 30

Simplifying
x = 30

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