-a+4=20

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Solution for -a+4=20 equation: 


Simplifying
-1a + 4 = 20

Reorder the terms:
4 + -1a = 20

Solving
4 + -1a = 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 + -1a = 20 + -4

Combine like terms: 4 + -4 = 0
0 + -1a = 20 + -4
-1a = 20 + -4

Combine like terms: 20 + -4 = 16
-1a = 16

Divide each side by '-1'.
a = -16

Simplifying
a = -16

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