3a-21=9b

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Solution for 3a-21=9b equation: 


Simplifying
3a + -21 = 9b

Reorder the terms:
-21 + 3a = 9b

Solving
-21 + 3a = 9b

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 = 21 + 9b

Combine like terms: -21 + 21 = 0
0 + 3a = 21 + 9b
3a = 21 + 9b

Divide each side by '3'.
a = 7 + 3b

Simplifying
a = 7 + 3b

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