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    25+28+(25-x)*4.3=(50+6.5x)/1.5
    8x^3-4x^2-4x+1=0
    (e^x-x-1)*(sinx+x*cosx)=(e^x-1)*(x*sinx)
    2x=-lnx
    2x=-lnx
    x*sinx*(e^x-1)=(e^x-x-1)*(sinx+xcosx)
    x*sinx*(e^x-1)=(e^x-x-1)*(sinx+x*cosx)
    x*sinx*(e^x-1)=(e^x-x-1)*(sinx+x*cosx)
    x*e^x-x=(e^x-x-1)*(1+x÷tanx)
    3x^2+60.2x-11.7^2*3
    x*e^x-x=(e^x-x-1)*(1+x*tanx)
    xe^x-x=(e^x-x-1)(1+xtanx)
    ((x^3)^-2)=1000
    X^2+X^3=150
    28x^2-56x+23=0
    -1*[2+abs(4X+4)]^2+4=X^2-4
    Rf-0.175=15%+Rf
    Rf+0.175=15%-Rf
    (1928+X)/(4420+X)=0.45
    (1928+X)/(4420+X)=0.44

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