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17 lines (16 with data), 445 Bytes 

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        segment .data

a       dq      175

b       dq      4097

sum     dq      0

diff    dq      0

        segment .text

        global  main

main:

        mov     rax, [a]    ; mov a (175) into rax

        mov     rbx, rax    ; mov rax to rbx

        add     rax, [b]    ; add b to rax

        mov     [sum], rax  ; save the sum

        sub     rbx, [b]    ; subtract b from rax

        mov     [diff], rbx

        xor     rax, rax

        ret