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    (x-3(500-(x-4)÷0.1x10)=800
    8x^2-27+3x
    8xx-27+3x
    (x-3)(504-x)=800
    (x-3)(504-x)=800
    (200-160-x)(20+2x)=1200
    (200-160-x)(20+2x)
    (200-x-155)( 20+2x)
    x+0.03x=100
    x+0.03x=100
    x²+1=0
    x+680x/2080=23
    9x^2-160x-36=0
    -x²-7X+60/4x²+60x
    1/x+1/x+15=1/4
    xlnx/x^2-1
    X -2÷ X
    X^2+6X=17×17
    X
    (18-x)*(300+30*x)=5850

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