(82-75)/(75-61)=(85-X)/(X-71)
    82-75/75-61=85-X/X-71
    (2100-500*x)*5=500
    （82-75）/（75-61）＝（85-X）/(X-71)
    x²＝50-2x
    x0.3
    0.5x+1000=1500
    M*10%+2226.63+M*50%*2224.57+M*40%*584.81=3271662
    M*10%+2226.63+M*50%*2224.57+M*40%*584.81=3271662
    x^2-47.36x+1874.494=0
    (14/9-2x)*(14/9-2x)/(2/9-x)/(20/9)=49
    4=2*2*x/2+x
    6*x＾5+5*x＾4+4*x＾3+3*x＾2+2*x+1=0
    3*x＾5-1=0
    3*x＾2-1=0
    12.09x=（3.5+x）×8.98
    lnx＝e-x
    ex＝1.31
    22x+30（1/2x+15）=6000
    x^2-12x-60=0

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