21=a+3

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Solution for 21=a+3 equation:


Simplifying
21 = a + 3

Reorder the terms:
21 = 3 + a

Solving
21 = 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 + -1a = 3 + a + -1a

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

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

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

Combine like terms: 3 + -21 = -18
-1a = -18

Divide each side by '-1'.
a = 18

Simplifying
a = 18

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