0.1q²-3q+30=120
    0.1q²-3q+30=120
    10lg（r/5）+0.3（r-5）=15
    101.6/(1+X/12*12)=79.8
    10/(1+(X/12*3))+25/(1+X)=15
    12b=8b
    x^3-24x+32=0
    7500/（x+9.9+11.88）+10000/（x+9.9）+10000/241=143
    0.7367x-0.103456sin(2πx)-0.086125=0.2122(sin(πx))^3+0.036sin(πx)+0.036sin(1.25π-2πx)
    7500/（x+9.9+11.88）+10000/（x+9.9）+10000/210=143
    7500/（x+9.9+11.88）+10000/（x+9.9）+10000/240=143
    7500/（x+9.9+11.88）+10000/（x+9.9）+10000/210=143
    7500/（x+9.9+11.88）+10000/（x+9.9）+10000/210=743
    x^3-3/8*x^2 -5/8=0
    x^3-3/8^x -5/8=0
    3800x-5000（1+x）*8%*50%=0
    (300+10a)(40-a)-(800-15a)=11350
    (300-10a)(40-a)-(800-15a)=11350
    (300-10a)(40-a)-(800-20a+5a)=11350
    (300-10x)(40-x)-(800-20x+5x)=11350

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