20-a=5a-4

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Solution for 20-a=5a-4 equation:


Simplifying
20 + -1a = 5a + -4

Reorder the terms:
20 + -1a = -4 + 5a

Solving
20 + -1a = -4 + 5a

Solving for variable 'a'.

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

Add '-5a' to each side of the equation.
20 + -1a + -5a = -4 + 5a + -5a

Combine like terms: -1a + -5a = -6a
20 + -6a = -4 + 5a + -5a

Combine like terms: 5a + -5a = 0
20 + -6a = -4 + 0
20 + -6a = -4

Add '-20' to each side of the equation.
20 + -20 + -6a = -4 + -20

Combine like terms: 20 + -20 = 0
0 + -6a = -4 + -20
-6a = -4 + -20

Combine like terms: -4 + -20 = -24
-6a = -24

Divide each side by '-6'.
a = 4

Simplifying
a = 4

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