（7.38x+24.4）(9-x)=325
    0.075v^3+4v-350=0
    x^2-1.5x+1-0.5×e^（-0.5）=0
    x^2-1.5x+0.697=0
    50 = 0.6167x - 16.331
    50 = 0.65x - 17.663
    50 = 0.4334x - 10
    309/31*x+194.5/31*(x+15)+93/31(x+30)=1230
    x(x+4)(x^2+2x+2)+7(x+3)=0
    x/（100+x）=0.1569
    8m^3-36m^2+54m+37
    k²-6k-23=0
    2x²+150x＝150²π½
    x^2-1.5*x+1-1.5×e^（-0.5）=0
    s^4+7s^3+42s+30=0
    50 = 0.7333x - 32.995
    y^3+3y+2=0
    x/x-32-30=2
    50 = 0.7166x - 30.997
    xex－5ex+5＝0

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