21=9a

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Solution for 21=9a equation:


Simplifying
21 = 9a

Solving
21 = 9a

Solving for variable 'a'.

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

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

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

Add '-21' to each side of the equation.
21 + -21 + -9a = 0 + -21

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

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

Divide each side by '-9'.
a = 2.333333333

Simplifying
a = 2.333333333

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