-2x²+9x-6=0
    7x^3+11x^2+17x-3=0
    160000+2x=12x
    100+10x=540-40x
    30+0.1x=0.15x
    （3X+2）/4=8
    2000+1500x=4*5000x
    arsin0.4677=
    arsin0.4677
    1.6=-1/10(x-5)²+3.2
    x^2=x+1
    x=(x+1)^2
    x^2=(x+1)^2
    x=x+1
    0.625x+250=-x
    40（1+x）²=48.4
    （X-12207.66）*30=12958
    （12207.66-X）*30=12958
    950=60*（1+x）^10+1000*((1-(1+x)^10)/x)
    8*x^3-6*x+1=0

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