20a-420=420-8a

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Solution for 20a-420=420-8a equation:


Simplifying
20a + -420 = 420 + -8a

Reorder the terms:
-420 + 20a = 420 + -8a

Solving
-420 + 20a = 420 + -8a

Solving for variable 'a'.

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

Add '8a' to each side of the equation.
-420 + 20a + 8a = 420 + -8a + 8a

Combine like terms: 20a + 8a = 28a
-420 + 28a = 420 + -8a + 8a

Combine like terms: -8a + 8a = 0
-420 + 28a = 420 + 0
-420 + 28a = 420

Add '420' to each side of the equation.
-420 + 420 + 28a = 420 + 420

Combine like terms: -420 + 420 = 0
0 + 28a = 420 + 420
28a = 420 + 420

Combine like terms: 420 + 420 = 840
28a = 840

Divide each side by '28'.
a = 30

Simplifying
a = 30

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