20-4*x=20-2*x-x^2
    (12*sqrt(2)-2*x)*x=32
    x*99.975%-125.570*100.025%=2/10
    x*99.975%-125.570*100.025%=1/10
    x*99.975%-125.624*100.025%=2/10
    x*99.975%-125.624*100.025%=1/10
    -x4-6x3-13x2-12x-2=0
    2x+x^2=20
    2x+x^2=30
    1.175=（（0.021*x^1.85+398）^0.5）*x^0.84
    （26.326+x）×1.55＝52.652+71.278-x
    （26.326+x）×1.75＝52.652+71.278-x
    （26.326+x）×1.95＝52.652+71.278-x
    （26.326+x）×2.15＝52.652+71.278-x
    （26.326+x）×2.35＝52.652+71.278-x
    （26.326+x）×2.55＝52.652+71.278-x
    （y²/2）+y/2＝2025
    x+7%x=31
    x^6-6x^5-15x^4-20x^3-15x^2-6x-1=0
    x+8%x=14

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