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    -63x^2+610x-285
    0.047 = -0.0009x2 + 0.0178x + 0.1168
    x=840-2*(860-2x)
    x=2*(860-2x)-840
    x+4/0.3-2x-0.3/0.5=1
    y = -0.0007*17.8832^2+0.0294*17.8832+0.0061
    x^2-2x+5=0
    12×6×47+6×6×6=15×15x
    x^3+0.1x^2=2*10^(-29)
    5y-8y+3y=12-6
    atanx+atan0.1x+atan10x=180
    1+102.01x^2+100.01x^4+x^6=250000
    x^2+8x+20=0
    atanx+atan10x+atan0.1x=180
    atanx+atan10x=60
    atanx+atan(0.1x)=180
    atanx+atan(0.1x)=180
    arctan(0.1x)+arctanx+arctan(10x)=180
    -1.096927829603988=(1/x)*ln(1-x)
    -1.089784066725562=(1/x)*ln(1-x)

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