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    1/d+1/(d+3)=1/d
    1/d+1+1/d+3=1/d
    0.134699/x=0.1289/0.86289
    0.4/100.58=x/33.87
    (20X)+25(80-X)=1700
    X(80-X)=1700
    e^x-3+x=0
    -(4-x)(6+x)+(4-x)[(5-x)(3-x)-9]=0
    x^2+x^-2=2
    x^3/4
    (5-x)(5-x)(2-x)-8(5-x)=0
    (5-x)(5-x)(3-x)-9(5-x)+3-x+27=0
    106.9651x^0.464667e(0.066007-0.264028x)=20
    106.9651x^0.464667e(0.066007-0.264028x)
    -(1/3)=(36+x^2-64)/(12x)
    x^2+4x-28=0
    (2^x-1)/(2^x+1)
    x÷(100+x)=0.1
    x+x²=96
    (x-9)/4000*9=(x-12)/2000*12

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