Mathematics
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    a^2-4a=0
    (x+3)*(x+7)
    228/125a=288/5
    y=log0.4
    7x^2+6x-9=0
    240=240*(0.1+0.6+0.06)*(1+a%)
    X=0 Y=206 W=850 H=1
    2x+3(62-x)=150
    5x-15*5=2x
    8(x-1)^3=27
    0.5((3-x)^2)=8
    0.5(3-x)^2=8
    (3x-1)+(5-2x)=0
    x*0.8+(1650-x)*0.21=1650*0.35
    (440*63-1500+297-x)*0.85+18*63=23673.45
    (10-x)*(1000+100*x) = 9600
    (10+x)*(1000-100*x)=9600
    (400-50*x)*(8+4*x)=4800
    1600x=120×(9-x)
    2000*(1+x)^2=2880

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