4x－(6+x)=18
    0.5x^2+180*x=9.8775
    0.75=x/(x+6.8)
    3/x=1/(x+6.8)
    0.6=32-x/x
    （110－x）（41-2x）＝3570
    2^x－2^（－x）＝1.6
    （55500×12-70%×15X×4.4%）÷（30%×15X+3%×15X） =3.8%
    32.197*x^2+61.985*x=10
    6x^(3)-18x^(2)-1=0
    (3k)^0.6=1/4
    2x+1>-5-x
    2x>-5-x
    2(-4+y)+y=1
    (1+x+(1/3)x^2)e^(-x)=0.2
    2x*x减5x+2＝0
    3x^2-8x-16>0
    x^4-24x^3-168x^2-100x+400
    x^4-16x^3+95x^2+16x-64 = 0
    75x^3+35x^2-40x+16/3=0

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