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We need to find the value of x

Let's screen the options
1. The equation presented has just 1 variable, hence can be equated. Sufficient

Keep this choice and eliminate B, C and E

2. Same as 1. 1 variable, 1 equation, can be computed. Sufficient

We should not try to equate for solution, just an understanding of a likely solution is enough for a DS question.

D is answer.
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