3(2a+1)+a=-39

Solution for 3(2a+1)+a=-39 equation:

Simplifying
3(2a + 1) + a = -39

Reorder the terms:
3(1 + 2a) + a = -39
(1 * 3 + 2a * 3) + a = -39
(3 + 6a) + a = -39

Combine like terms: 6a + a = 7a
3 + 7a = -39

Solving
3 + 7a = -39

Solving for variable 'a'.

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

Add '-3' to each side of the equation.
3 + -3 + 7a = -39 + -3

Combine like terms: 3 + -3 = 0
0 + 7a = -39 + -3
7a = -39 + -3

Combine like terms: -39 + -3 = -42
7a = -42

Divide each side by '7'.
a = -6

Simplifying
a = -6