(587.4-X)*(50/60)=192
    x-cosx=0
    x（3500-84x）=10025
    x^2+【（24-x)×(40-x）】×2=520
    3^2x×5=60
    1920-128x+3x^2=520
    （lnx）2÷x
    （180+x）（60-x÷10）=14000
    （140+x）（60-x÷10）=14000
    3y^2-56y+48=0
    429/(2711*0.562/1.8) = 794/(794-54+x)
    3（1+X）（1+X）=6.75
    429/(2711*0.562/1.2/2)=794/(794-54+x)
    429/(2711*0.562/1.2)=794/(794-54+x)
    592/(x+592)=0.3841
    x(x+12)=864
    40(1+x)^2=39.5
    40x^2+120x-70=0
    m²+12m-29=0
    m²+12m-20=0

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