# Using prope

Given:

To check: T is an empty set or not

-(4x – 40)(13 – x) = (4x – 40)(x – 7)

(4x – 40)(x – 7) + (4x – 40)(13 – x) = 0

(4x – 40)(x – 7 + 13 – x) = 0

6(4x – 40) = 0

24(x – 10) = 0

x – 10 = 0

x = 10

So, T = {10}

T is not an empty set

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