95-x0.55x+0.3(95-x)=43.5
    95-x0.55x+0.3(95-x)=43.5
    3x^2－10x+5
    x*0.61*2.88*1.99=2.35
    x*0.61*2.88*1.71=2.35
    x*0.61*2.88*1.66=2.35
    x*0.61*2.88*1.22=2.35
    0.05363x^2-4x-120=0
    x×x×x-x×x-1＝0
    -x^2+193.03x=9072.94
    2=-3x
    16:280=x:1000
    10x-4(3-x)-5(2+7x)=15x-9(x-2)
    3a*3=27
    3（2-3x）-3{3（2x-3）+3}=5
    x-13/4=-1/x-13/4
    0=0.03+0.0000027*ln(0.00053*sin(x)+0.000523)-0.0000028*sin(x)*ln(1+0.0053*sin(x))+0.0000027
    x^2+1/x^2=7
    x^2+80x+400 = 0
    x^2-80x+400=0

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