-3x²+48x=180
    -3x²+46x=180
    x（-3x+46）=180
    2（x+1）²=2.88
    3/x+2/(x-1)-1/(10-x)=0
    x*x+11.6x=2320
    x=x+10
    x^3+3x^2+5x+4=0
    x3+3x²+5x+4=0
    x²+3x²+5x+4=0
    x^3-x^2-3x/2+1/2=0
    x^2/（0.05-x）=1.6x10^-7
    x^2-4.5x+5=0
    188.6+127.4*x=77*(x+3.7)
    353.6+127.4*x=77*(x+3.7)
    x^2-5x=10
    16^x=8x
    x*x-10.4x+11.8=0
    x^2-10.4x+11.8=0
    （56+X）÷（80+X）=0.7

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