x2+5x-6=0
    7（x-1）=5x+3
    e20x=0.01sin20x
    7（x-1）＝5x+3
    7(x-1)=5x+3
     400-(500-x)/1.09*0.09*1.12-100*0.0006=x
    7(x-1)=5x+3
    (20-x)(32-x)=540
     400-(500-x)/1.09*0.09*1.12-400*0.0006=x
    2x-4=10-5x
     261278.65-(339773.73-x)/1.09*0.09*1.12=x
     261278.65-(339773.73-x)/1.09*0.09=x
    400-（500-x）/1.09*0.09*1.12-100*0.0006=x
    400-（500-x）/1.09*0.09*1.12-500*0.0006=x
    261278.65-（339773.73-x）/1.09*0.09 = x
    339773.73--3177.12-（339773.73-x）/1.09*0.09 = x
    261278.65-（261278.65-x）/1.09*0.09=x
    11=-0.0232X2+2.4909X+2.4747
    8862*(1+x)^24=200000
    8862*（1+X）^24=200000

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