Doubt: Gregmat+ Quant Quiz

This is a quant comparision question from Math Fundamentals/Basics Quiz #2: Level 3

given equation:
6x^2 + 3x = 30

A: The sum of all valid x values
B: 0

The answer key has answer: B. How though?
When you solve for x you get -2 and 5/2.
Their sum gives 1/2. The answer should be A right? Or am I missing something?

Can you share a screenshot of the problem?

You didn’t solve the quadratic properly, try again.

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