x-x*0.2=309
    x-x*0.2=305
    x-x*0.2=300
    x-x*0.2=318
    x-x*0.2=323
    X-X*5%-X/1.09*2.4727%=274560.39
    x-x*5%-x*2.269%=274560.39
    X-X*5%-X/1.09*2.4727%=274560.39
    x-x*5%-x*5%=100
    x-x*0.23=488
    x-x*5%-x*2.89%=100
    x-x*5%-x*2.427%=274560.39
    -2x²+27.139x＝5.417
    x*(76-0.00955*x)=17786.26
    10/89.14+0/133.58+7/44.7+24/1650+X/200+(52.3-X)/1000=0.384
    10/89.14+0/133.58+7/44.7+25/1650+X/200+(52.3-X)/1000=0.384
    2x-1/3-3＝0.3x+0.5/0.2
    2x-1/3＝0.3x+0.5/0.2
    3/2x-1＝0.2/0.3x+0.5
    5x=58

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