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
    11x+1=5(2x+1)
    4x-8=7-x
    3x+3=2x+7
    5x-2=8
    X(X+1)=2024
    7x+47=180
    2x—68＝x
    x^2+x=600
    0=9a^4+40a^3+46a^2+16a−11
    -0.2x=-8
    0.2x+89=0.5（1200-x）
    xe^(-x)=2
    x*e^(-x)=2
    x(1+e^(-x))=4
    0.7X+0.9(160-X) = 136
    0.7X+0.9(160-X)=136

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