（26.326+x）×1.75＝71.278+52.652-x
    （26.326+x）×1.55＝71.278+52.652-x
    （2x-1）÷3=x-2
    0.8(x-2)+5.6=48-3.2(x+5)
    5x-39-3x=6-7x
    10x-11=4x+25
    81-7(2x-3)=18
    6x-2(x-4)=24
    (26.326+x)×1.55＝52.652+71.778-x
    (26.326+x)×1.75＝52.652+71.778-x
    (26.326+x)×1.95＝52.652+71.778-x
    (26.326+x)×2.15＝52.652+71.778-x
    (26.326+x)×2.35＝52.652+71.778-x
    (26.326+x)×2.55＝52.652+71.778-x
    3490000/x^2-395101/x+10194.04=0
    26=4*(1/(1+r)+1/(1+r)^2+1/(1+r)^3+1/(1+r)^4+1/(1+r)^5+1/(1+r)^6+1/(1+r)^7+1/(1+r)^8)
    e^(-3.14x/(sqrt(1-x^2)))=0.163
    3490000/x^2-366113/x+8255.58=0
    (2/x)+1/(x+6)=1/(x+4)
    (2s-2)(s^2+1.5s-1)=(s^2-2s+5)(2s+1.5)

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