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    3x + 1/3(20-x) = 20
    x^2-31x+42=0
    lnx=1.250469
    lnx=1.121857
    lnx=39.41814264487216
    lnx=39.4181426
    20÷√(0.25×x^2+1)÷√(0.0025×x^2+1)=1
    lnx=1.42857
    -22.6%=-7.6%+r+r×(-7.6%)
    2x-1=x-3
    -9y^2+7y-2=0
    15/89.14+5/44.7+2/50+X/200+(52.3-X)/1000=0.436
    √4-x²
    x(x+1)=110
    x^4-4x^3+4x^2-2x=0
    x÷6=x+(6+2)+5
    5/4x÷2=1
    X0.88=5
    x(0.1+2x)²=8.49×10^-9
    2.5/(3.48+x)=(12-2.5)/30000

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