x=11000-2000-120-(0.2x+424)+(0.21x+212)-550
    (0.2x+424)+(0.21x+212)=8966
    12000-60*(7.68+1.83x)+3000*0.785*x^2*(0.8/x)^(1/3)=30000
    (0.2x+424)+(0.21x+212)=8330
    (2x+424)+(21x+212)=8330
    (0.2x+424)+(0.21+212)=8330
    12000-60*(7.68+1.83x)+3000*1.54*(0.8/x)^(1/3)=30000
    (0.893-x)*100+0.2=107.9
    (0.893-x)*100+0.2=107.9
    x/tanx
    (6x-1)^2-25=0
    3^x=x^9
    (2x+1)^2=3
    √（16-3x^2）
    (x-1)^2=9
    y^2-144=0
    （（x^2-900）^0.5+1.39x=68.33
    （（x^2-000）^0.5+1.39x=68.33
    （（1.36x）^2-400）^0.5+0.69x=91.03
    2x^2+x-6=0

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