# How do you simplify 12a - 3 + 6a?

Nov 7, 2015

$3 \left(6 a - 1\right)$

#### Explanation:

You can first collect like terms:
$12 a$ and $6 a$ are alike, with $a$ behind both of them. So we can add them together:
$\left(12 a\right) + \left(6 a\right) = 18 a$
What is left behind is a $- 3$
So the full equation after collecting like terms is: $18 a - 3$
We can factor out a $3$ from the new equation by deviding each term by $3$.
$\frac{18 a}{3} - \frac{3}{3}$
So after factoring we get: $3 \left(6 a - 1\right)$