Answer:
Identity property of multiplication
Step-by-step explanation:
From step 5:

Here, to solve for x so that the variable x stands alone, Alberto uses the identity property of multiplication, which justifies what he has in step 6.
Step 6:

According to the identity property of multiplication, any value you multiply by 1 gives you that same value.
Therefore, 1x = 1 × x = x.
The variable x multiplied by 1 will give you x.
Distribute the 3.
3*x + 3*4
3x + 12
Hope this helps :)
<span> 7.58e8
= </span><span> 7.58 x 10^8
= 758,000,000</span>