20=a+4a

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Solution for 20=a+4a equation:


Simplifying
20 = a + 4a

Combine like terms: a + 4a = 5a
20 = 5a

Solving
20 = 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 + -5a = 5a + -5a

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

Add '-20' to each side of the equation.
20 + -20 + -5a = 0 + -20

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

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

Divide each side by '-5'.
a = 4

Simplifying
a = 4

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