Tricky Maths Equation

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???




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O_er_t_o_

Complete the missing letters of the given word.

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The responses of all the suspects are mentioned below.

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Peter was in the 2nd bedroom.
So was I.
David was in the bathroom.

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I agree with Joseph that David was in the bathroom and Peter was in the 2nd bedroom.
But I think that Joseph was in the living room, OH MY GOD!

Peter:
Mandy was in the kitchen with Christopher.
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David:
I still say Peter was in the 2nd bedroom and Jennifer was in the bathroom.
Joseph was in the 1st bedroom.

Jennifer:
Peter was in the bathroom with Christopher.
And Mandy was in the kitchen.

Christopher:
David was in the kitchen.
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PS: The corpse was found in the Living Room.

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Every words stands for unique digit that makes the arithmetic equation true

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