15*x*277-1.6*x*303=1.6*303*147.74
    220x^2-596x+121=0
    10482.382-11.253974*x+1.231*10^28*x^(-9)=0
    11005.029-11.841867*x+7.9337*10^(-20)*x^(7)=0
    x²－7x＋6＝0
    x²－3/2x＋1/2＝0
    x²－3/2＋1/2＝0
    x＋5＝5
    （20t-90）²+（30√3）²=【60（t-2）】²
    (9535+40+x)*（4.69%+1.25%）=4x
    (9535+40+x)*（4.69%+1.8%）=4x
    (9535+40+157.95)x=4*157.95
    (9535+40+x)*1.8%*4.69125%=4x
    (9535+40+x)*1.8%=4x
    (2x²-9)(2x²-1)
    2*d*d*d+15*d*d+24*d+8=0
    （s+4)*(3*s*s+6*s+2)-s*(s+1)*(s+2)=0
    x^4－5x²+9/4=0
    （30-2x）×（20-x）＝78×6
    x4－5x²+9/4=0

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