x%*15%+(70%-x%)*20%+30%*10%=13%
    11x^3-14x+12=0
    2x^3-14x+3=0
    （1200/2x）-（1200/3x）=10
    1200/2x-1200/3x=10
    (155+271.5)/31*x+177/31*(x+15)+124/31(x+30)=1029
    3206.6*（1+y）^23=13*10^8*420
    987050000*（1+x）^23=1300000000
    9.8705*（1+x）^23=1300000000
    x
    x^3-8x^2+8x+24=0
    x3+8x2+8x+24=0
    x²－40x＋24=0
    0.2*x-0.04*x=46000
    0.1*x-0.04*x=46000
    0.1*x-0.04=46000
    0.4388 = 0.5438×x^3 - 1.5291×x^2 + 1.9844×x + 0.0007
    x+1=(x+1)²-4-4
    (x-160)^2+x^2=185^2
    x^2+x-225=0

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