5%=（X-1801）/1801
    5%=（X-1070）/1070
    10%=（X-128）/128
    10%=（X-622）/622
    X*10=100
    10%=（X-1826）/1826
    84.5/(1+(x/12*6))+0.325/(1+(x/12*13))=78.325
    3x/5x+100=4/7
    3x−50/5x−50=4/7
    3x−50/5x−50=4x/7x
    -11200+x-x*2%*3=1000
    -11200+x-x*2%=1000
    31.3+x-x*6%*3/12=51
    20x=30(x-7)
    3x−50=4x
    4x−50=7
    3x−50=4
    3x−50/5x-50=4/7
    X+X*0.04=645
    90*(1-x)(1-x)=40

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