X+X*0.01=768
    280/X=240/（X-30）
    42459=30.08x+0.022x^(2)
    0.4286*x^2+0.4171*x+0.074= 0
    X^2-26X+160=0
    10^7/2666.67
    32x^2-x+190=0
    0.7453*x^2+2.1195*x+1.4542=0
    6/0.1/0.15^2
    x^2-3100x+263570=0
    42459=43.78x+0.022x^(2)
    0.8571*x^2+2.0723*x+1.1846=0
    (1+x)^25=4.249
    1.7857*x^2+2.1586*x+0.542=0
    10^6/88.89
    6*(0.15^2/4-0.025^2)/0.1/0.15^3
    s^3+50s^2+5000s+5000*1=0
    s^3+50s^2+5000s+5000*2000=0
    s^3+50s^2+5000s+5000*150=0
    x^2-3100x+239610=0

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