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    X*100/67/1/149*100=269
    X*100/41/1/149*100=230
    X*100/48/1/149*100=269
    66*100/41/1/X*100=108
    47*100/41/1/X*100=78
    13*100/X/1.05/123*100=24
    148*100/67/1/X*100=152
    26*100/X/1.05/123*100=30
    26*100/X/1.05/123*100=14
    27*100/X/1/126*100=14
    12-2x+6x-8=5x+35-3x+7
    27*100/X/1/120*100=14
    x^4+7.1*x^3+10.7*x^2+61*x+18=0
    55x=55*5+55(55-x)
    55x=55*5+55(55-x)+750
    X^2+2 x=0
    2500/1+9e0.2t
    20lg(1/x)=-15
    20*lg(1/x)=-7.1
    20*lg8-2*20*lg1.88=x

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