x^7+2x-1=0
    x^2-8x+4=0
    sinx=cosx-（1/secx）
    （6x+7)-(3x-5)=2
    -x^2+10x+48-3x=30
    -3x^2+10x+48-3x=30
    x^2-7/3x=6
    x^2+12*x/25+1=0
    a×0.6=20.98
    45.8×a×0.6=19.98
    45.8×a×0.6=19.98
    1.65*12x-1.5*10x=660
    -1/3y=-6
    49.6×a×0.6=19.9
    x*3.99*1.15=4.03
    500 x+250×5/2x=22500000
    500 x+250×5/2x=22500000
    500 x+250×5/2x=22500000
    500 x+250×5/2x=22500000
    500 x+250×5x/2

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