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P p

+

T

(

)

E e

+

T

(

)

=

D d

+

T

(

)

P p

+

L

(

)

E e

+

L

(

)

=

D d

+

L

(

)

D

=

P

E

Pp

+

PT

Ee

ET

=

Dd

+

DT

Pp

+

PL

Ee

EL

=

Dd

+

DL

Expanding:

P L

T

(

)

E L

T

(

)

=

D L

T

(

)

Subtracting and grouping:

QED