e^x+2/x
    1.65*12x-1.5*10x=660
    6x/5=1
    -2t²+2.4t=0.7
    －3t²+2.4t=0.7
    72000000/x/100=3000
    49x²＋36x－36＝0
    72÷x÷100=1000
    x+1/x=3
    x+1/x=0
    (20-x）（100+10x)=2240
    x ^2-10x-204=0
    x ^2-10x+204=0
    x^2+45x-20=0
    x^7+2x-1=0
    x^2-8x+4=0
    sinx=cosx-（1/secx）
    （6x+7)-(3x-5)=2
    -x^2+10x+48-3x=30
    -3x^2+10x+48-3x=30

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