21=9+5a

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Solution for 21=9+5a equation:


Simplifying
21 = 9 + 5a

Solving
21 = 9 + 5a

Solving for variable 'a'.

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

Add '-5a' to each side of the equation.
21 + -5a = 9 + 5a + -5a

Combine like terms: 5a + -5a = 0
21 + -5a = 9 + 0
21 + -5a = 9

Add '-21' to each side of the equation.
21 + -21 + -5a = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -5a = 9 + -21
-5a = 9 + -21

Combine like terms: 9 + -21 = -12
-5a = -12

Divide each side by '-5'.
a = 2.4

Simplifying
a = 2.4

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