1-(1/30)x=(1/50)(x+30)
    1-(1/30)x=(1/50)(x+30)
    (12+x)/(200+x)=0.2
    X^²
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+（x+4000）/2080=48-26
    80000a=64000*(a+400)
    x/578+（x+4000）/2080=48
    x∧3+2x∧2+x+1＝0
    （600/x）-（600/1.25x）=3
    600/x-600/1.25x=3
    lnx+1-2x=0
    0=lnx+1+2x

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