12a-9a-a=20

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Solution for 12a-9a-a=20 equation: 


Simplifying
12a + -9a + -1a = 20

Combine like terms: 12a + -9a = 3a
3a + -1a = 20

Combine like terms: 3a + -1a = 2a
2a = 20

Solving
2a = 20

Solving for variable 'a'.

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

Divide each side by '2'.
a = 10

Simplifying
a = 10

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