y=
    x×x＋x＝90
    6x+7=19
    9x^2-120x+800=0
    x*x+x+4=0
    x^x=100
    xx+34890xx+43=785469
    xxxxxxxxxxxxxxxx+xxxxxxxxxxx+xxxxxxx=123
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx+21894xxxx=327685
    5xxxx+3xxx-xx+13x+24=0
    xxx+7x+2=0
    xx+x+1=0
    1/(D+3)=1/(D+1)+1/(D+2)
    1/D+3=1/D+1+1/D+2
    80+5t/2=3(80-25t/2)
    8x-27.54/2.7
    (a+3)^0.2/3+(a+3)^0.2/a=64(a)^0.2/3
    1/4x^2-x=8/9x+4
    1/4x^2-x=8/9x+4
    X-(X*0.13)-(X*0.1)=5350.5

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