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    -5t×t+10t=-7.5
    -5t×t+10t=7.5
    x²-20x+48=0
    4t-7=10t-t×t
    5t²-12t+4=0
    (10-x)(30+5x)=315
    10(1+x)²=14.4
    (200+10x)(64-x)=14400
    k²-k-2=18
    (x-8)[100-10(x-10)]
    (2-x)(100-10x)
    (x-3)²+2x(x-3)=4
    (x-20)[400-20(x-30)]
    (10+x)(400-20x)
    (x-10)[5000+5000(13-x)]
    -(x-1)²+4
    x^2÷[2×10^(-2.19)-x]= 5.2×10^(-3)
    x^2+5.12×10^(-3)-1.04×10^(-4.19)=0
    x^2÷[2×10^(-2.19)-x]=5.2×10^(-3)
    x-2x^2-4x^3+3=0

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