-2[a]-6=-20

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Solution for -2[a]-6=-20 equation: 


Simplifying
-2[a] + -6 = -20

Reorder the terms:
-6 + -2a = -20

Solving
-6 + -2a = -20

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 + 6 + -2a = -20 + 6

Combine like terms: -6 + 6 = 0
0 + -2a = -20 + 6
-2a = -20 + 6

Combine like terms: -20 + 6 = -14
-2a = -14

Divide each side by '-2'.
a = 7

Simplifying
a = 7

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