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    (30×0.15+50×x)÷(30+50)=0.2
    (30×0.15+50×x)÷(30+50)
    43×3.45%+(1105-43+44+2%X)×[(1+3.45%)0.5-1]
    43×3.45%+(1105-43+44+2%V)×[(1+3.45%)0.5-1]
    3/2*n
    lgX=68.95
    lgx=68.95
     x^2+0.052x-0.10044=0
    5x+1=6x
    sqrt(-x^2-6x-1)=sqrt(9-x^2)+4
    ((x^3)^-2)=1000
    52x^12-6x+1+x^5-x^7+17-x^13
    x(52x^12-6x+1+x^5-x^7+17-x^13)
    ((x^3)^-2)=1000
    x^7-6x-55
    x^7-6x-5
    2x+15=(8x+12+16)÷2
    8x÷2
    x^7-6x-5
    x^7-6x-5

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