(40-30-x)(600+5x)=8625
    x=sin(x)*49/20
    110m-m²=525
    -m²+110m=525
    x=sin(x)*49/20
    x-1/5x-(1-1/5)50%=780
    x-1/5x-(1-1/5)50%=780
    (1.8+x)/(x-0.6)=6/x
    7.11*x^1.5=（x+1.28）^1.7-1.28^1.7-0.1*x^0.5
    40=(5+10/k)*(k+2)
    -1.07=1/xln(1-x)
    6/x+6/(2x-5)=1
    8*（0.9x）＝12x-35
    （100-x）×80＝（95-x）×100-100
    50(1-x^10)/(1-x)=100
    50(1-x^10/(1-x)=100
    x^4÷5
    n+0.01n=200000
    x^4+4x+1=0
    1/x+2/x=x+1

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