2x+7+1=13
    3.6+r=6.02
    2x+7+1=12
    2x+3=7
    12(9+r)=144
    100000*(x/(1.4128-x))+500000*(x/(4.3250-x))+200000*（x*10000/(14675.0000-x*10000))+((3.00-1.50)*20+(2.00-1.25)*25+(3.00-1.50)*10-76.25)-34.19>=0
    l(1-1/6)-37%=463%
    k/8+45%=70%
    t/5-11/10=7/10
    v/1.4-3.3=1.7
    4(13+15d)=196
    9/4+2c/5=57/20
    100000*(x/(1.4128-x))+500000*(x/(4.3250-x))+200000*（x*10000/(14675.0000-x*10000))-34.19-76.25>=0
    b+22%/15%=4.4
    24000=x-（x*22%）
    8(a-0.7)=6
    0.5u+0.8=2.2
    a(11/6-11/12)+6/5=23/10
    7j+5.9=14.3
    2*(x^4)+10*(x^2)-169=0

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