3a-21=24

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Solution for 3a-21=24 equation: 


Simplifying
3a + -21 = 24

Reorder the terms:
-21 + 3a = 24

Solving
-21 + 3a = 24

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 21 + 3a = 24 + 21

Combine like terms: -21 + 21 = 0
0 + 3a = 24 + 21
3a = 24 + 21

Combine like terms: 24 + 21 = 45
3a = 45

Divide each side by '3'.
a = 15

Simplifying
a = 15

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