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    4.5x+0.45=5.4x
    x=5200+(x-5000)*0.03
    25x/(25+x)=10
    (1+x%)(1+x%)=1.44
    2.4+x/12+x=0.25
    (1+x%)=1.44
    5x+4=7x+6
    3x+2=5x+4
    11x^2-150x+459=0
    255-(1/2)a=2×(1/2)a
    50k^3-41k^2-10k+9=0
    (2x^2)/(0.1-x)=6.25*(10^-12)
    (2x^2)/(0.1-x)=6.25*10^-12
    (x+6)(34-x)=160
    (x-8)(34-x)=160
    (15-5t)(15-5t)+25=13
    2.9/7.1×30/X=0.04
    (20-x)(32-x)=540
    x^2-4x-1=0
    2x-1=0

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