-2(n+3)-a=0

Solution for -2(n+3)-a=0 equation:

Simplifying
-2(n + 3) + -1a = 0

Reorder the terms:
-2(3 + n) + -1a = 0
(3 * -2 + n * -2) + -1a = 0
(-6 + -2n) + -1a = 0

Reorder the terms:
-6 + -1a + -2n = 0

Solving
-6 + -1a + -2n = 0

Solving for variable 'a'.

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

Add '6' to each side of the equation.
-6 + -1a + 6 + -2n = 0 + 6

Reorder the terms:
-6 + 6 + -1a + -2n = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1a + -2n = 0 + 6
-1a + -2n = 0 + 6

Combine like terms: 0 + 6 = 6
-1a + -2n = 6

Add '2n' to each side of the equation.
-1a + -2n + 2n = 6 + 2n

Combine like terms: -2n + 2n = 0
-1a + 0 = 6 + 2n
-1a = 6 + 2n

Divide each side by '-1'.
a = -6 + -2n

Simplifying
a = -6 + -2n