3-(7/5)x=9/10
    x×ex+ex+x-1=0
    Y=(100+09Y)+50
    3465x^4-5240x^3+2835x^2-660x
    3465x^4-560x^3+330x^2-560x+160
    49x 2 −28x+4 3465x 4 −5240x 3 +2835x 2 −660x ＝0
    0＝−8120x^4(14x−3)^2+2320x^3(14x−3)−6860x^2(14x−3)^2+980x(14x−3)+5880x^3(14x−3)^2−1260x^2(14x−3)+588
    0= -6300 * ( 14 * x - 2 ) ^ -2 * x ^ 4 + 1800 * ( 14 * x - 2 ) ^ -1 * x ^ 3 - 6300 * ( 14 * x - 2 ) ^ -2 * x ^ 2 + 900 * ( 14 * x - 2 ) ^ -1 * x + 3920 * ( 14 * x - 2 ) ^ -2 * x ^ 3 - 840 * ( 14 * x - 2 ) ^ -1 * x ^ 2 + 3920 * ( 14 * x - 2 ) ^ -2 * x - 560 * ( 14 * x - 2 ) ^ -2 - 280 * ( 14 * x - 2 ) ^ -1
    0= -4000 * ( 10 * x - 3 ) ^ -2 * x ^ 4 + 1600 * ( 10 * x - 3 ) ^ -1 * x ^ 3 - 4000 * ( 10 * x - 3 ) ^ -2 * x ^ 2 + 800 * ( 10 * x - 3 ) ^ -1 * x + 4200 * ( 10 * x - 3 ) ^ -2 * x ^ 3 - 1260 * ( 10 * x - 3 ) ^ -1 * x ^ 2 + 4200 * ( 10 * x - 3 ) ^ -2 * x - 900 * ( 10 * x - 3 ) ^ -2 - 420 * ( 10 * x - 3 ) ^ -1
    0= -5600 * ( 14 * x - 3 ) ^ -2 * x ^ 4 + 1600 * ( 14 * x - 3 ) ^ -1 * x ^ 3 - 5600 * ( 14 * x - 3 ) ^ -2 * x ^ 2 + 800 * ( 14 * x - 3 ) ^ -1 * x + 6860 * ( 14 * x - 3 ) ^ -2 * x ^ 3 - 1470 * ( 14 * x - 3 ) ^ -1 * x ^ 2 + 6860 * ( 14 * x - 3 ) ^ -2 * x - 1260 * ( 14 * x - 3 ) ^ -2 - 490 * ( 14 * x - 3 ) ^ -1
    -8120 * ( 14 * x - 3 ) ^ -2 * x ^ 4 + 2320 * ( 14 * x - 3 ) ^ -1 * x ^ 3 - 6860 * ( 14 * x - 3 ) ^ -2 * x ^ 2 + 980 * ( 14 * x - 3 ) ^ -1 * x + 5880 * ( 14 * x - 3 ) ^ -2 * x ^ 3 - 1260 * ( 14 * x - 3 ) ^ -1 * x ^ 2 + 5880 * ( 14 * x - 3 ) ^ -2 * x - 1260 * ( 14 * x - 3 ) ^ -2 - 420 * ( 14 * x - 3 ) ^ -1＝0
    840x^3-828x^2+469x-120
    3x²－2x－3÷2
    x+（576*x+4000）/2080=49
    x+（576*x+4000）/2080
    x^3-40x^2-400x=0
    4*x+8/3*x+24=5/6
    s^3+0.4s^2+0.04s-0.000006=0
    s^3+0.4s^2+0.04s-6*10^(-6)=0
    x×x×x×x－x×x×x－x×x－x－1=0

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