-9=2a+a

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Solution for -9=2a+a equation:


Simplifying
-9 = 2a + a

Combine like terms: 2a + a = 3a
-9 = 3a

Solving
-9 = 3a

Solving for variable 'a'.

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

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

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

Add '9' to each side of the equation.
-9 + 9 + -3a = 0 + 9

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

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

Divide each side by '-3'.
a = -3

Simplifying
a = -3

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