18+5x =21
    5x-39=56
    4x-2=10
    x²＋56x－180＝0
    x^2/(x-1)
    x^3-4x＝693
    x×x×x－x×x－x－1＝0
    x²1/x
    3y^2-4+6y=0
    2x=0
    x=0
    20=3t+t*t
    x²+3x
    80*12*10+150*8*t=80*30*10
    2/x+1/(x+2)+1/(x+4)-1/(x+1)＝0
    2x^2-x-4=0
    S=1.04²(1.04−1/1.048−1)1.048*28600
    S=1.04²{1.04−1/1.048−1}1.048*28600
    S=1.04²[1.04−1/1.048−1]1.048*28600
    S=1.04²（1.04−1/1.048−1)1.048*28600

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