x+1/x=57/40
    x^2+x=57/40
    40x^2+40=57x
    40x^2-57x+40
    -250a^2+122a=137
    -250x^2+122x=137
    2x×x=1
    53-3x=14
    2x^3-50x+45＝0
    x^2x
    x^4-3x^2+4x-5=0
    x×(1+20%) = 24
    x×(1+20%) = 24
    x×(1+20%)
    200+0.6y+40
    0.0578x-0.0003x²=1.957
    0.578x-0.0003x²=1.957
    0.578x+0.0003x²=1.957
    0.578x-0.003x²=1.957
    1/x-sin(1/x)

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