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    30X-30X+(21+30X)*0.1=26
    20.5+X-(X*2%)=50
    x^3+x^2+1 = 0
    (47+x)/(87+x)=0.55
    (x-x/1.09*0.03)*0.02=4798406.39
    6*cos(x)^3-6*cos(x)^2-23*cos(x)+18=0
    x=arccos(2/3)
    x=arccos2/3
    x^4-x^3-x^2-x-1=0
    6*(cosx)^3-6*(cosx)^2-23*cos(x)+18=0
    x^3+10x-20
    sin(2x)-2x=0.72π
    X=(5000+2000)*5/3
    -50-(100+X)*1%+x=10
    -50-(100+X)*1%+x=10
    (180-x)*(1-0.2)+x=150
    0.04×x^3+1.04×x^2+x^2-49=0
    1.0787x/(40+1000x)=0.00005
    1.0787x/(40+1000x)=0.0002
    1.0787x/(40+1000x)=0.0001

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