x^2-13*x+40=0
    2*(x-3)=3*x*(x-3)
    (2-5*x)+(5*x-2)^2=0
    (x+2)^2+4*x=0
    x^2+8x+7=0
    x^2+x-4=0
    x^2+x-2=0
    35+x-(560+x)*6%/4=70
    5/4x=135
    35+x-(560+x)x6%/4=70
    x/(6.25-x)/(3.125-x)*10^9=10^6*1.106
    x/(6.25-x)/(3.125*4-x)*10^9=10^6*1.106
    x/(6.25*4-x)/(3.125*4-x)*10^9=10^6*1.106
    x/(6.25*4-x)/(3.125*4*4-x)*10^9=10^6*1.106
    x/(6.25*4*4-x)/(3.125*4*4-x)*10^9=10^6*1.106
    x/(6.25*4*4-x)/(3.125*4*4*4-x)*10^9=10^6*1.106
    x/(6.25*4*4-x)/(3.125*4*4*4-x)*10^9=10^7
    x/(6.25*4*4-x)/(3.125*4*4-x)*10^9=10^7
    x/(6.25*4-x)/(3.125*4*4-x)*10^9=10^7
    x/(6.25*4-x)/(3.125*4-x)*10^9=10^7

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