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    40x-320=30x+420
    x^2+6x=123
    e^x=x
    16+x=(128+x)*3/5
    3x-2=6x+5
    3x-2=6-x+3
    3x-1.7x=18
    3x=6-x
    (((x/2+1)/2+2)/2+3)/2=6
    -1.083=1/xln(1-x)
    0.8[10+2.4x+0.8(x-10)+0.4*x/40*60]-(14+7*2.2+x-10)=1.8
    x^2+9x=400
    (1+m/2%)×1000×(1+m%)×500=660000
    2.2x+0.5*2=7.6
    2.2x+0.5*2=7.6
    2.2x+0.5*2=7.6
    cosx=0.58
    cosx=-0.43
    sinx=-0.36
    sinx=0.72

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