X-4x
    0.8*750*x=1.8*4200*80
    3
    (16/5)x-(24*12/5^0.5)x+24^2=0
    8%（1+8%）∧10÷（1+8%）∧10-1
    （180-4x）（120-6x）=2/3*120*180
    2x+2≥3x-3
    x÷3+2
    3/x+2
    1.9X-1.3X=1.8
    x/3+2
    x+6<6x
    5x^2-80x+320=0
    36÷(2x+6×3)=1
    40000-400x+x^2=0.959x/4
    11.28x^3+16.46x^2-328.38x-3804.82=0
    3c^(2)-4c-36=0
    x^2+3x-5=0
    0 = -0.5471x5 + 26.03x4 - 473.47x3 + 4152.8x2 - 14347x + 9737.4
    x/500+x/400=6.75

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