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
    800.988+147.70125x=9.9572*(6.1045+x)+156.6425*(1.67+x)+373.8*(175+x)+217.23*x*0.5*x+0.5*(270.93*(x/2.1)-217.23)*x*(x/3)
    2x+12.9=14.5
    sqrt(49-X^2)+sqrt(169-(10-X^2)=18
    1/4-1/9
    2x+4.3x3=14.5
    x+17=26
    2XX+8X+1=0
    1.04x^10=1135
    e^x-x-1=0
    x^2-2.1396*x+1.1612=0
    12.08x^3+111.36x^2+158.35x-495.18=0
    -2x1x2+2x1x4+2x2x3+2x3x4
    -x^3+3x^2-2x+1=0
    6.63=(7-a)/ln(7/a)

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