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    X÷5000-1-5X÷6000=2
    x²+(2√2)²-2*2√2 *x*cos30=4
    (628-X)/X=70%
    x^2-2x-2=0
    x^2-2x-2=0
    x^2-2x-3=0
    520*1000000=13.8*x*456*(420-x/2)+13.8*(1000-456)*100*(420-100/2)
    520*100000=13.8*x*456*(420-x/2)+13.8*(1000-456)*100*(420-100/2)
    470.06*1000000=13.8*x*435*(780-x/2)+13.8*(1000-435)*130*(780-130/2)
    256(1+x)=400
    9^(n+1)-3^3n=72
    470.6=13.8*435x*(780-0.5x)+13.8*(1000-435)*130*(780-0.5*130)
    x2+6x=5
    x2+6x=5
    y∧3-3y²+3y+1=0
    -3y²+3y+1=0
    -3y²+3y+1=0
    (2*x)^2=19*(0.4-2x)^2*(1-x)
    2*x=19*(0.4-2x)^2*(1-x)
    2*x/(1-x)=19*(0.4-2x)^2

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