PSAT Math Multiple-Choice Question 701: Answer and Explanation
Question: 701
Solve for
- A. 24
- B.
- C.
- D. 6
Correct Answer: D
Explanation:
(D) We want to isolate what's inside the parentheses with the goal of eventually isolating x. Let's first get that 6 out of the denominator by multiplying both sides by 6:
To isolate what's inside the parentheses, we have to divide both sides by 12:
Now we can get rid of the parentheses:
To isolate our x-terms, multiply both sides by 2:
5x - 2x = 18
Combine the like x-terms:
5x - 2x = 3x = 18
Because 3x = 18, it follows that x = 6.
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