2x-5=x-4
    x^2+x
    0.466/(X/(X+6.12))=0.534/(6.12/(X+6.12))
    X/(X+6.12)
    (8-x)^2/x-0.795
    2.45×342×(20+X)=1.68×690×(20-X)
    34.62/（1+X）=30.77
    142.95/（1+X）=132.33
    177.86/（1+X）=162.16
    39.64/（1+X）=35.23
    29.32/（1+X）=27.13
    34.62/(1+(x/365*36)=30.77
    142.95/(1+(x/365*51)=128.73
    177.86/(1+(x/365*81)=144.16
    20%=(0.8075x -100.95 )/0.8075x
    39.64/(1+(x/365*46)=35.23
    29.32/(1+(X/365*16)=27.13
    29.32/(1+(X/24*1)=27.13
    x∧2+x-1=0
    x+x/11.3=22.75

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