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    x^3-x-1= 0
    10y²-2y-24/5=0
    arccos(x)=x
    (x-2)*(x-2)+(2x+1)*(2x+1)+(-2x-3)*(-2x-3)=9
    2x3
    80%x+40=16+x
    (x+50)80%-x=16
    (x-1)(3-x)
    (x+50)X80%—x=16
    x=√3/2×x-1/2
    2.5x(0.8/0.9)^0.5
    20*x=x*(10+10+(x-1)*2)*0.5
    3q²-40q+240=0
    31776.01X*0.2+31776.01*(1-X)*3.5=111216.03
    3q²-40q+240=640
    6355.20X*0.2+31776.01*(1-X)*3.5=111216.03
    3q²+40q-400=0
    6355.20y*0.2+31776.01*(1-y)*3.5=111216.03
    31776.01X*0.2+31776.01*(1+X)*3.5=111216.03
    3q²-40q-400=0

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