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    x+x*0.09=8000
    x+x*0.09=47980
    x=4/15(28/5-x)
    0=-0.4(x-1)(x-1)+3.2
    3x^2+2cosx-1=0
    x^2+(34-x)^2=342
    x^2+(34-x)=342
    12×(2+x)=-18
    4a+1=0
    17t²=98+56t
    12x^2+25x+12=0
    x-0.2x=3100
    x-0.15x=3100
    x +4 /x
    1.25x/(1-0.25x^2)=1
    3×s^2+8×s+13=0
    3×s^2+8s+13=0
    (2s+4)s+(s×s+4s+13)=0
    (32+x)*3-(32-x)*4=10
    (11227+28×60+5000+60X)/93=X+121+28+12

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