3[a+18]=9

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Solution for 3[a+18]=9 equation: 


Simplifying
3[a + 18] = 9

Reorder the terms:
3[18 + a] = 9
[18 * 3 + a * 3] = 9
[54 + 3a] = 9

Solving
54 + 3a = 9

Solving for variable 'a'.

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

Add '-54' to each side of the equation.
54 + -54 + 3a = 9 + -54

Combine like terms: 54 + -54 = 0
0 + 3a = 9 + -54
3a = 9 + -54

Combine like terms: 9 + -54 = -45
3a = -45

Divide each side by '3'.
a = -15

Simplifying
a = -15

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