(x-45)²＋150＝x*x
    50x-x²=336
    (3-x)^2=2x
    (3-x)^2=1
    4x^3+21x^2+20x=0
    8x^2+51x-27=0
    100/96=X/18
    25/24=x/9
    x^3+ln(x)-2 = 0
    x^3+ln(x)-1=0
    -x^2-10x-16=0
    x^3+3x^2+2x=0
    x^3+3x^2+2x+1=0
    15=100×（X-216）/（X×160/100）
    K=283+5.7+1.2+14.5+0.0536K
    K=293+5.86+1.27+15+0.0536K
    (220*2*55-x)*0.9+18*55=19738.4
    5-x=3
    x^3+5x^2+25=0
    ln(x+(x^2+1)^(1/2)=5

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