121x/(121+x)=605/6
    16m^4-20m^2+6m+1=0
    16m^4-20m^2+6m-1=0
    x^3+2x^2+10x=20
    x^5-15x^4+85x^3-225x^2+274x-120=0
    x+x*0.06=361
    lg x=-1780/308.15+0.00754×308.15+4.53
    tan-1 of 0.125
    1-7x+6x^2-x^3=0
    8*k^4-8*k^3+8*k^2+6*k-1=0
    0.2x=0.6(8.8-x)
    asin(1/(1+1/x))*2=90
    X-0.2-X*0.5-0.4+0.5=0
    X-0.12-X*0.5-0.4+1=0
    X-0.12-X*0.5-0.8+1=0
    X-0.2-X*0.5-0.8+0.5=0
    X-0.12-X*0.5-0.8+1=0
    (200+5x)(50-x)=10125
    (52-2x)(28-2x)=640
    108x-36x^2=12*8

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