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    4x*3+3x*2+4x+3=0
    x^3+2x^2+5x+1=0
    2x^2+5x+1=0
    2x^2+5x+2=0
    x^2-2*x+ln(x)-1=0
    (119-x)/193 = 0.40
    (119-x)/(193-x)=0.40
    x+4+20+15%x+(x+15%x)*13%=2600
    (0.01x + 220) * 45 = x
    e^x-1/2√x-1
    1/2√x
    (4.5+x)/x=(3.5+15)/3.5
    16(0.75a-300)=13(a-405)
    x*x*x-x*5+(39/25)
    (select 198766*667891)
    n×(n-1)×(n-2)×(n-3)×(n-4)÷(5×4×3×2)×(1÷(n×(n-1)×(n-2)))^((n-5)÷(n-3))=3÷40
     n×(n-1)÷5×(3÷n)^(n-5)=1
     n×(n-1)÷5×(3÷n)^(n-5)=0
     n×(n-1)÷5×(3÷n)^(n-5)=10
    n×(n-1)÷5×(3÷n)^(n-5)

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