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    x^4=3x^2+9-9x
    (x-2130)/2.9935 = x^(2/3)
    (x-2680)/2.1544=x^(2/3)
    x-2680=2.1544x^2/3
    50.76x²+1.5912x-0.0099=0
    1+5+2+56+5+65+5x=1
    3s^2+12s+8=0
    10%X=400*60%
    2.736-0.063x=0
    0.064x-1.36+0.36=0
    0.064x-.36+0.36=0
    500=x*(11-8)-100
    (2x-3)(3x-2)=10
    x-3(x+2)=14
    18t-3t²=10
    (18-6x)(1.5-0.5x)=(18+6x)(1.5+0.5x)-(18+6x)
    x^2-11.9x+35.4=0
    x^3-3*x+1=0
    (2+a)*(100-10a)=350
    0.3+y=3.2×(0.1-y)×(0.01-y)

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