4a=21-a

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Solution for 4a=21-a equation:


Simplifying
4a = 21 + -1a

Solving
4a = 21 + -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
4a + a = 21 + -1a + a

Combine like terms: 4a + a = 5a
5a = 21 + -1a + a

Combine like terms: -1a + a = 0
5a = 21 + 0
5a = 21

Divide each side by '5'.
a = 4.2

Simplifying
a = 4.2

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