3a-1=12

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Solution for 3a-1=12 equation: 


Simplifying
3a + -1 = 12

Reorder the terms:
-1 + 3a = 12

Solving
-1 + 3a = 12

Solving for variable 'a'.

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

Add '1' to each side of the equation.
-1 + 1 + 3a = 12 + 1

Combine like terms: -1 + 1 = 0
0 + 3a = 12 + 1
3a = 12 + 1

Combine like terms: 12 + 1 = 13
3a = 13

Divide each side by '3'.
a = 4.333333333

Simplifying
a = 4.333333333

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