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    (2400*0.959+x)/(2400+x)=0.98
    (2400*0.959+x)/(2400+x)=0.97
    (2400*0.959+x)/(2400+x)=0.99
    (2400*0.959+x)/(2400+x)=0.96
    x*(252÷1.2x-1/3)=180
    x*(252÷1.2x-(1/3))=180
    120X-(1/3)X=180
    2X=180
    [(42-2x)/2]x=110
    [(28+4+8-2x)/2]x=75
    (2x-3)^2=25
    (2x+2)^2=144
    (12-2x)(6-2x)=40
    (1-m+3)(m+4)=7
    m(26-2m)=60
    25-2x=12
    x(25-2x)=50
    (40+m-30)(600-10m)=10000
    150(x+1)^2=216
    3x+2=5x-3

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