2(a+4)+2a=-20

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Solution for 2(a+4)+2a=-20 equation: 


Simplifying
2(a + 4) + 2a = -20

Reorder the terms:
2(4 + a) + 2a = -20
(4 * 2 + a * 2) + 2a = -20
(8 + 2a) + 2a = -20

Combine like terms: 2a + 2a = 4a
8 + 4a = -20

Solving
8 + 4a = -20

Solving for variable 'a'.

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

Add '-8' to each side of the equation.
8 + -8 + 4a = -20 + -8

Combine like terms: 8 + -8 = 0
0 + 4a = -20 + -8
4a = -20 + -8

Combine like terms: -20 + -8 = -28
4a = -28

Divide each side by '4'.
a = -7

Simplifying
a = -7

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