[3x-21]=0

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Solution for [3x-21]=0 equation: 


Simplifying
[3x + -21] = 0

Reorder the terms:
[-21 + 3x] = 0

Remove brackets around [-21 + 3x]
-21 + 3x = 0

Solving
-21 + 3x = 0

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 + 3x = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 0 + 21
3x = 0 + 21

Combine like terms: 0 + 21 = 21
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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