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    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
    (10-0.5*x)*(576+6*x)=4800
    400*(1+x)^2=576
    400*(1-x)^2=576
    (1.2*0.8)x=96
    X=(1.2*0.8)*96
    X=(1.2*0.8)÷96
    1.2X*0.8X=96
    1.2*0.8=96X
    96X=1.2*0.8
    X=96÷1.2*0.8
    √(x+3)=x+1

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