(1+0.1x)(500-10x)=800
    20*(26-x)=45x
    -600*（T/600-298.15/100)=2.5(T-298.15)
    2x=1
    0=3.5*8.314*ln(T/298.15)+8.314*ln(1/6)
    1.01^x/0.99^x=100
     0 = 3.5*8.314*ln(T/298.15)+8.314*ln(1/6)
     0 = 3.5*8.314*ln(x/298.15)+8.314*ln(6)
    0=3.5*8.314*ln(T/298.15)+8.314*ln(6)
    0=3.5*8.314*ln(x/298.15)-8.314*ln(6)
    0=3.5*8.314*ln(T/298.15)-8.314*ln(6)
    0=2.5*8.314*ln(T/298.15)-8.314*ln(6)
    0=1.5*8.314*ln(T/298.15)-8.314*ln(6)
    sin(π)=x
    3x+5=9
    3x+5=9
    3x+5=9
    x²-35x+100=0
    (mm-11*11)+11*11=mm
    40-x=x-25

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