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    600x/(1800(1-x))=6/94
    600x/(1800(1-x))=0.06
    (2x-1)/3-4=-0.5x-2
    2(x+1)/3=5(x-1)/6-1
    2x/3+1/3=5x/6-1/6-1
    x/3-x/2+0.5=1
    3825x∧2-570x-551=0
    h=(0.014*1922.8/0.025^0.5)^0.6*(9+2h)^0.4/9
    h=221.4222/(0.95*(19.6*(153.5158-h))^0.5)
    1.2*30%+0.9*20%+x*50%=1
    30+x*50%=1
    (20%*10+75%*y)/(10+y)=25%
    (20%*10+75%*x)/(10+x)=25%
    20%*10+75%*x/10+x=25%
    0.1*0.165*0.33+0.5*0.115*0.23+0.4*(−0.185)*(−0.37)=x
    x+e^x=0
    x^4-3*x^3+3*x+1=0
    188*x*x+640*x+840=0
    (4.8-x)* (4.8-x) +1.4*1.4=x*x
    (4.8-x)^2+1.4*1.4=x*x

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