(80-x+10)÷3+x÷4×6=100
    (80-x+10)÷3+x÷4×6=100
    1/(2^x)
    55X59
    3cosx+sinx
    2n+n＾2=143
    3x^2+2x-1
    (10-2p)p
    2πr=6.28
    mod(10,3)
    mod(3,6)
    1mod8
    2*x/2
    !(pi)
    tan x=4
    20050517=2024r
    x-0=x+0
    w²=e
    x+e=x-e
    x+π=x-π

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