3a+21=30

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Solution for 3a+21=30 equation: 


Simplifying
3a + 21 = 30

Reorder the terms:
21 + 3a = 30

Solving
21 + 3a = 30

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 = 30 + -21

Combine like terms: 21 + -21 = 0
0 + 3a = 30 + -21
3a = 30 + -21

Combine like terms: 30 + -21 = 9
3a = 9

Divide each side by '3'.
a = 3

Simplifying
a = 3

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