12+3a=30

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Solution for 12+3a=30 equation: 


Simplifying
12 + 3a = 30

Solving
12 + 3a = 30

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 = 30 + -12

Combine like terms: 12 + -12 = 0
0 + 3a = 30 + -12
3a = 30 + -12

Combine like terms: 30 + -12 = 18
3a = 18

Divide each side by '3'.
a = 6

Simplifying
a = 6

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