446=x+x*1.2+x*1.3+x*1.4
    2519674.83=x-x0.2
    x/580*517.647/2945.793741=83.333333/3029.127074
    x/580/517=83.333333/3029.127074
    x^4-8x^3+20x^2-24x+12=0
    x^4-1.9919x^2+0.9919=0
    (X+2000)*4%=X
    0.507/((40+8.5X)/(90+15.3X))=0.492/((50+6.8X)/(90+15.3X))
    x^4-4x^2+2=0
    （1-x）/x
    （113557.77-x）+x=113557.77
    x^4-399x^2-400=0
    1473184.0575=x-x0.2
    x^4-19x^2-20=0
    (1+x)*(300-10x)=1300
    1.6278*x+0.001=0.3
    x∧2-25x+150＝0
    2x＝tanx
    X+((X/21.75）/8*2.5*22*1.5）+((X/21.75）/8*10.5*2*6）+(X/21.75）/8*10.5*3=5800
    x+(x/20.83)*2*5 =4000

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