9=21-6a

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Solution for 9=21-6a equation:


Simplifying
9 = 21 + -6a

Solving
9 = 21 + -6a

Solving for variable 'a'.

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

Add '6a' to each side of the equation.
9 + 6a = 21 + -6a + 6a

Combine like terms: -6a + 6a = 0
9 + 6a = 21 + 0
9 + 6a = 21

Add '-9' to each side of the equation.
9 + -9 + 6a = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 6a = 21 + -9
6a = 21 + -9

Combine like terms: 21 + -9 = 12
6a = 12

Divide each side by '6'.
a = 2

Simplifying
a = 2

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