XX-7X+9=0
    1/12x+1/9（10-x）=1
    900+2699x^2-1.02x^6-20.45x^4=0
    2x^(2)=600+0.3（2x+20）^(2)
    x^3-7x^2+7x+2=0
    x=1.9×0.723×143.98/200000×(1.9×30+0.08×32/0.0241)
    x=1.1-0.65×2.01/(0.0241×143.98)
    x=(882.44×10^6)/(0.87×730×9650.4)
    (x-4)^3+2-3*(x-4)=0
    (x-2)^2*(x-3)-9x+14=0
    25x^2+7.2x-9+0.81=0
    200(x-3)=120(x+5)
    x^4-x^x+2*x+1=0
    2((x+6)/3)^3-x((x+6)/3)^2=2(x/3)^3-x(x/3)^2
    124.76-20.27x-30.69/(2×1.9) x^2
    0.13*X+X=400
    （35-X）（26-X）=850
    7x^2-10x-71=0
    -0.197=17.269x/(237.3+x)
    7x^2-10x-71 =0

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