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    2(7-y)+3y=15
    1.3x-x=150
    X+3x+1.2x=650
    X+3x+1.2x
    (-16/x+1)+24-x
    -73/14+x=2
    576x^4-287x^2-108=0
    35-2(x-0.1)=2.8
    e^x=x^-1
    (X+1)*(x+2)
    40/(200+x)=3/20
    40/200+x=3/20
    96÷x+72÷0.6x=60
    20lgk=12 k=
    16000/(x×2)=40000÷(x+10)
    (1+x)*x/2=1000000
    (1+x)*x/2
    x(150-x)=3600
    5-t=t-1
    (140-100-a)(300-2a)=1200

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