（6-x）((4-x)(5-x)-9)=3
    946.93x^(2)+1843.86x-153.07=0
    1/d+1/(d+1)+1/(d+4)=1/(d+1.5)
    29y+4*29+15y=1700
    4(x-8.6)=36.4
    60%h-20=88
    29y+3*29+15y=1700
    35+3c=47
    29y+29+15y=1700
    29y+58+15y=1700
    0.6x+90+60=1.4x*(0.4x+90+60)
    42x+42x^2+42x^3+42x^4+42x^5-150=30x+30x^2+30x^3+30x^4+30x^5-100
    0.1477=x/(100+x)
    0.6x+90+60=1.4*(0.4x+90+60)
    0.3896=x/(100+x)
    42/(1+x)+42/(1+x)^2+42/(1+x)^3+42/(1+x)^4+42/(1+x)^5-150=30/(1+x)+30/(1+x)^2+30/(1+x)^3+30/(1+x)^4+30/(1+x)^5-100
    56.37x^3-400x^2+901.92x-6400=0
    0.357/(1+1.7x)+0.0276/(1+0.12x)-0.3009/(1-0.51x)=0
    60-x=22.10*(ln(70-x)-ln10)
    100x^3-400x^2+1600x-6400=0

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