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    64x+4xx=192
    4×(16+x)=12×(16÷x)
    (54664-2.5X)*10.8/21.8*0.9=18261+9X
    20.25-x^2*(4.5+x)^2=576
    −x^4-9^3+182.25x-165.9375=0
    -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)]

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