X/87-(96-X)/125=0.73
    A×3.2%/360×90+A=2
    A×3.2%/360×330+A=2
    A×3.2%+A=2
    A×3.2%/360×30+A=2
    A×3.2%×30+A=2
    A×3.2%×330+A=2
    A×3.2%/360×270+A=2
    -ln（x-1）
    tan(x)-x
    【（220+220）*63-X】*0.85+8*63=21679.45
    X/126-(92-X)/1000=0.238
    2=A×3.1%/360×90+A
    （x-x/40）+70 = 8500/0.95
    x^2+22x+9=0
    0.5x+3.5=5x-8.5
    0.5x+3.5=5x-8.5
    -(53√5 +22)(x+6)/382=-x^2/4-x+3
    x^2+41x-86=0
    x^3-6x+1=0

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