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    x(x-1)=55
    x*e∧(-0.0000005*x)=20064
    5/6X-1/6X=5/7
    (70-x)(250+x)=6000
    (150-x)(250+x)=6000
    1/(1+x)-ln(1+1/x)
    0=0.5t^2-3.5t-6.125
    (6000*31.25+4000*125/3)(1-12/5a)=31.25(1-a)*6000(1-3/2a)+125/3*4000(1-5/2a)
    x
    (6000*31.25+4000*125/3)(1-12/5a)=31.25(1-a)*6000(1-3/2a)+125/3*4000(1-5/2a)
    x*arctan(1/x)
    x*arctan(1/x)
    (50x+50) *(8-x) =300
    (1-cos(π-x))/sin(π-x)=(2+6*(π-x)/π)/7
    (40-x)(20+2x)=1050
    (40-x)(20+x)=1050
    5.5x=20
    8*sqrt(5)*x+5*x*x=2
    10*sqrt(15)*x+5*x*x=2
    x^2-x-0.5=0

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