What is true about the variable x when the variable n is a negative number?

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250

How is this equation completed? i cannot find any examples in the book.