-26/7-5x=12
    x²－2x－3
    2x+35/2=12
    6.7x+9.4=12.3（x-4）+2.6
    4x^2-4x+5=0
    12.07x=(x+3.4)*8.97
    12.07x=(x+3.3)*8.97
    12.07x=(x+3.2)*8.97
    X×100-X=193.05
    X-193.05=X÷100
    X-193.05X÷100=X÷100
    X÷100-X=193.05
    X-X÷100=193.05
    X-（400-X）*2.6=420
    16000/（2x-32）=9600/x
    （260*63-x）*0.95=13563.15
    （260*63-2400+99*3-x）*0.95=13563.15
    6^x-5^x=11
    10.6X等于7.2
    1680/（1.4x)=1400/x-10

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