y=2y/4+3
    2y/4+3
    220=x×31+x×21+x×10
    -x*x+36x=180
    (x*92%)+(x*92%*6%)=42736.22
    (x*92%)+(x*92%*6%)=435682.4
    14+（1/4）x-2=（3/4）x+2
    14+（1/4）x-2=（4/3）x+2
    14+4/1x-2=4/3x+2
    x²+5x＝2250
    150y-y^2=3600
    1/2-x/2=2-x
    2210492.13-x-0.05x-650+12611.59=663041.07
    2x^2+2x＝11
    8x+x+4＝11
    8x^2+4x+4＝11
    0.|123x=1
    x^2+7x=60
    sin(cos(tan6x))=1
    log(x,6)=2

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