21-5a=4a

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Solution for 21-5a=4a equation:


Simplifying
21 + -5a = 4a

Solving
21 + -5a = 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
21 + -5a + -4a = 4a + -4a

Combine like terms: -5a + -4a = -9a
21 + -9a = 4a + -4a

Combine like terms: 4a + -4a = 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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