3a-9=20

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Solution for 3a-9=20 equation: 


Simplifying
3a + -9 = 20

Reorder the terms:
-9 + 3a = 20

Solving
-9 + 3a = 20

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 3a = 20 + 9

Combine like terms: -9 + 9 = 0
0 + 3a = 20 + 9
3a = 20 + 9

Combine like terms: 20 + 9 = 29
3a = 29

Divide each side by '3'.
a = 9.666666667

Simplifying
a = 9.666666667

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