1-1/x=0
    （32-4x）（20-6x）=480
    7.9*exp(32900/x)=352+0.1584*(10/x^0.5)
    800.988+147.70125x=9.9572*(6.1045+x)+156.6425*(1.167+x)+373.8*(175+x)+217.23*x*0.5*x+12.7857*x*x*(x/3)
    800.988+147.70125x=9.9572*(6.1045+x)+156.6425*(1.167+x)+373.8*(175+x)+217.23*x*0.5*x+12.7857*x*(x/3)
    4.27=x*150*150-300*x+3.75
    (9-t)t=40.5
    800.988+147.70125x=9.9572*(6.1045+x)+156.6425*(1.167+x)+373.8*(175+x)+217.23*x*0.5*x+0.5*(270.93*(x/2.1)-217.23)*x*(x/3)
    d^4-161.43*d-75=0
    3.1415926*(210*1000/1200)^0.5
    12.08x^3+87.96x^2+58.36x-715.02=0
    y-9=(2y-18)*0.5
    x+3+2x=7x+1
    2.7=10^(44.24-x)+10^(16.64-x)+10^(2x-34.56)+10^(35.24-x)
    9x-x^2=40.5
    3x+5y＝98 8x+3＝158
    3.1415926*(210*1000/240)^0.5
    -x^3+15x^2-63x+81
    0.2+14.454x=x+144.54xx+1585xxx
    1.04x^20=1875.001033

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