For reason 3, look at how we got from step 2 to step 3.
In this case, we combined like terms or simplifies the left side.
So the reason for statement 3 is simplifying.
For statement 4, we look at how we got from step 3 to step 4.
Notice that we subtracted the same quantity, -12x, from both sides of the
equation and this is the subtraction property of equality.
For statement 5, we look at how we got from step 4 to step 5.
Here, we added the same quantity to both sides
and this is called the addition property of equality.
Finally, we use the division property of equality,
to get the final solution to the equation, x = 2/3.