9+6a-2a=21

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Solution for 9+6a-2a=21 equation: 


Simplifying
9 + 6a + -2a = 21

Combine like terms: 6a + -2a = 4a
9 + 4a = 21

Solving
9 + 4a = 21

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 + 4a = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 4a = 21 + -9
4a = 21 + -9

Combine like terms: 21 + -9 = 12
4a = 12

Divide each side by '4'.
a = 3

Simplifying
a = 3

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