3[a+3]=12

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Solution for 3[a+3]=12 equation: 


Simplifying
3[a + 3] = 12

Reorder the terms:
3[3 + a] = 12
[3 * 3 + a * 3] = 12
[9 + 3a] = 12

Solving
9 + 3a = 12

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + 3a = 12 + -9

Combine like terms: 9 + -9 = 0
0 + 3a = 12 + -9
3a = 12 + -9

Combine like terms: 12 + -9 = 3
3a = 3

Divide each side by '3'.
a = 1

Simplifying
a = 1

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