a-4=-20

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Solution for a-4=-20 equation: 


Simplifying
a + -4 = -20

Reorder the terms:
-4 + a = -20

Solving
-4 + a = -20

Solving for variable 'a'.

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

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

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

Combine like terms: -20 + 4 = -16
a = -16

Simplifying
a = -16

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