5a+21=a+3

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Solution for 5a+21=a+3 equation:


Simplifying
5a + 21 = a + 3

Reorder the terms:
21 + 5a = a + 3

Reorder the terms:
21 + 5a = 3 + a

Solving
21 + 5a = 3 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
21 + 5a + -1a = 3 + a + -1a

Combine like terms: 5a + -1a = 4a
21 + 4a = 3 + a + -1a

Combine like terms: a + -1a = 0
21 + 4a = 3 + 0
21 + 4a = 3

Add '-21' to each side of the equation.
21 + -21 + 4a = 3 + -21

Combine like terms: 21 + -21 = 0
0 + 4a = 3 + -21
4a = 3 + -21

Combine like terms: 3 + -21 = -18
4a = -18

Divide each side by '4'.
a = -4.5

Simplifying
a = -4.5

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