x-x*0.05-（X+704171.84）*0.0003=704171.84
    3.3/（10000+x）*x
    x^(2)-198.6 x-22500=0
    arctanx=45
    arctan（x/10）+arctanx=90
    x^2*（x^2/100+1）*（x^2+1）=6400
    arctanx+arctan（x/10）=30
    （8.82x-21）*(x-2.38)=216.7
     （1/6x）+4=2/3（21-x）
    （8.82x+37.4）*(9-x)=216.7
    （7.38x+24.4）*(9-x)=216.7
    （7.38x+24.4）(9-x)=216.7
    （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

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