50000=（100-50）*1800-x
    50000=（100-50）*x-50000
    50000=（100-x）*1800-50000
    50000=（X-50）*1800-50000
    58000=(50－x)×3600－50000
    46.7＝-1E-11x^4
    10x/11+200/11+23=5x/3
    C（2，4）
    3*x^2-2*x^3 = 0.974
    3*x^2-2*x^3=0.974
    sinx+sin(5x/2)=0
    sinx+sin(5x/2)=0
    sin(x)+sin(5x/2)=0
    sin(x)+sin(5x/2)=0
    -20y-20y
    x^2-x-1=0
    a²+50a-6600=0
    x^3-2=0
    x^6+2x^3+3=0
    5x^5+4x^4+3x^3+2x^2+x+1=0

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