3a+12=21

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Solution for 3a+12=21 equation: 


Simplifying
3a + 12 = 21

Reorder the terms:
12 + 3a = 21

Solving
12 + 3a = 21

Solving for variable 'a'.

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

Add '-12' to each side of the equation.
12 + -12 + 3a = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 3a = 21 + -12
3a = 21 + -12

Combine like terms: 21 + -12 = 9
3a = 9

Divide each side by '3'.
a = 3

Simplifying
a = 3

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