(6+a)+(6+2a)+(a)=

Solution for (6+a)+(6+2a)+(a)= equation:

Simplifying
(6 + a) + (6 + 2a) + (a) = 0

Remove parenthesis around (6 + a)
6 + a + (6 + 2a) + (a) = 0

Remove parenthesis around (6 + 2a)
6 + a + 6 + 2a + (a) = 0
6 + a + 6 + 2a + a = 0

Reorder the terms:
6 + 6 + a + 2a + a = 0

Combine like terms: 6 + 6 = 12
12 + a + 2a + a = 0

Combine like terms: a + 2a = 3a
12 + 3a + a = 0

Combine like terms: 3a + a = 4a
12 + 4a = 0

Solving
12 + 4a = 0

Solving for variable 'a'.

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

Add '-12' to each side of the equation.
12 + -12 + 4a = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 4a = 0 + -12
4a = 0 + -12

Combine like terms: 0 + -12 = -12
4a = -12

Divide each side by '4'.
a = -3

Simplifying
a = -3