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    20-x+0.5x=12.5
    3(400x2X)+4X+5X=1560
    3(400x2X)+4X+5X=1560
    x*x=112
    x^5-3*x-1=0
    x^5-3*x-1=0
    x/(1-x)^4=0.163186966
    x/(1-x)^4=1
    x²+1/x²-3x-3/x=2
    0.06X+X=73709
    0.06X+X=49429
    (x²-x)²-(x²-x)+12=0
    m²-m+12=0
    125=2t+6t²
    5y+15*(1200-y)={25y+45*(1200-y)}*30%
    25x+45(1200-x)=41000
    sinx=0.355x
    x√1-x^2=1/4
    x+x+160=2.5×x
    x^2(1-x^2)=1/16

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