（1+x）/ x=5
    x+1=2
    （x/1）+（x/x）=5
    x*cos(sqrt(50/x))=50
    sinx=0.95x
    (1+x)^5-1=2.5*x*(1+x)^5
    x∧(3/2)
    x∧2＝10+4√6
    5097.96=80372.25+x²-513.87x
    3t∧2－40t＋28=0
    x+28=x*3
    9t∧2－130t＋36＝0
    320000=(1100000-(100000+X))*0.3+X
    -a^4+a^3=0
    xx+x=240
    83.5-2x=0
    56+167x-3x^2=0
    56+83.5x-x^2=0
    x^3−4x−1=0
    x3−4x−1=0

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