b^2-2lnb+2=e2
    a^2-2ln a+1=e
    (30-x)(60+10x)=5280
    (30-x)(60+40x)=5280
    (30-x)(60+20x)=5280
    5/9x=5/8x-10
    5/9x=5/8x+10
    sinx/x
    100x=x+183.15
    x+2=10
    x+200=7x+14
    x²-6x-7=0
    x²-6x-7=0
    x²-6x-7=0
    x²-6x-7=0
    x²-2x-3=0
    x²-6x+5=0
    x²-x-6=0
    x²-5x-6=0
    x²+7x+6=0

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