This is not a trick question in fact, this question reflects a problem that looks exactly like something a student would see in Algebra I. Question 3, below, shows an inequality that asks students to solve for a variable c. The easiest way to illustrate this is to actually look at a practice problem and explanation from the KA site, so let's do that. I hate to say it, but there's no getting around it. Keeping these two things in mind, the Khan Academy's program content is deeply disappointing. The more familiar and grounded the prep, the less anxiety students experience approaching the tests.
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