3[X+2]=21

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Solution for 3[X+2]=21 equation: 


Simplifying
3[X + 2] = 21

Reorder the terms:
3[2 + X] = 21
[2 * 3 + X * 3] = 21
[6 + 3X] = 21

Solving
6 + 3X = 21

Solving for variable 'X'.

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

Add '-6' to each side of the equation.
6 + -6 + 3X = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 3X = 21 + -6
3X = 21 + -6

Combine like terms: 21 + -6 = 15
3X = 15

Divide each side by '3'.
X = 5

Simplifying
X = 5

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