156.8x=452600
    700/x=900/(x+20)
    700/x=900/x+20
    x/700=x+20/900
    25+x＝32+144.87-x
    X-X*0.065-X*0.0003=2200000
    140*3.5964+4*3+4*2+3.4*2+4=(140+3+2+2+1)*x
    140*3.5964+4*3+4*2+3.4*2=(140+3+2+2)*x
    140*3.5964+3.6*3+4*2+3.5*2=(140+3+2+2)*x
    140*3.5964+3.6*3+4*2+3.4*2=(140+3+2+2)*x
    140*3.5964+3.6*3+4*2+4*1+3.4*2=(140+3+2+1+2)*x
    140*3.5964+3.6*3+4*2+4*1+3.5*2=(140+3+2+1+2)*x
    140*3.5964+3.6*3+4*2=(140+3+2)*x
    5000000*（1-2.06%）-（5000000*（1-2.06%）/1.09*0.09-x/1.09*0.09）*1.12 -454809.6= x
    5000000*（1-2.06%）-（5000000*（1-2.06%）/1.09*0.09-x/1.09*0.09）*1.12=x
    100x+100x^2=150
    152x+152x^2=218.8
    1633-9212x+9604x^2=0
    16-4x=x-20
    2^x/2^x+1

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