Why is the answer B

GRE Quant Problem Solving
1

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Here if I multiply both sides by x and check for x values, I get D option

2

You cannot multiply x on both sides. That is going to skew the results.

For example,

x = -1

A = -1
B = 0

B>A

But since you multiplied x on both sides you made Quantity A a constant value of 1 which is wrong. That won’t work for any negative x value.