x^4+x^3-x^2+x+1
    x^4-x^3-x^2+x+1
    (0.063-x)/x＝5.72
    30*x+20x=855
    x^9 = 3^x
    0.8×(1+g)/10+g
    200*(200*500+200x+500x)=10000x
    x+1=2
    15166=（x*0.4*70+x*0.6*30）*0.9
    15166=（x*0.4*70+x*0.6*30）*0.9
    10000=（x*0.4*70+x*0.6*30）*0.9+18900-20286
    11386=（x*0.4*70+x*0.6*30）*0.9
    a-1÷2
    2-m/3-1
    (x-3)^2+(-x^2+3*x)^2=9
    0.1a^2+a+10
    (0.063-x)/x＝5.72
    -34.64x^2+41.568x=0
    -6x^3-4.64x^2+41.56x=0
    1.18x=49

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