X0.06+X=926940
    X0.06+X=350940
    0.19（X-60）+18
    400/x=900/(100-x)-500-5x
    4m^2-m=3/16
    x^2-8x+15=0
    -x^2+700x=122500
    4m^2-m=3/16
    x^2+3-2sqrt9x
    x^2+3-2sqrt3
    0.1352/x＝0.1289/0.86289
    0.4/100.58＝x/34
    （42.309+x）×1.55＝42.309+75.618-x
    4.8÷2x=1
    17x^2-32x+1532
    9x＾2-x＾4＝81／4
    （x-8）（400-200）=640
    (1+x)*(1+2*x)*(1+3*x)
    （x-70）（-2x+240）=1200
    （x-70）（-2x+240）=1200

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