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    144/25+(9216/125)^2=x^2
    144/25+9216/125=x^2
    arctan(0.6*x/(1-0.5*x*x))=90
    16+144/25+x^2=256/25+5/32x+x^2
    16+144/25x^2=256/25+5/32x+x^2
    (n+5)^2+2^2=(n+1)^2+7^2
    5^2+(m-2)^2=1+(m-7)^2
    x*x*(0.01*x*x+1)*(0.25*x*x+1)=100
    x^2+(48/x)^2=100
    x^2+(x/48)^2=100
    x*x-3x-1=0
    x2-3x-1=0
    7.97×(3.5+x)=12.12x
    20000*((1+x)^12-1)/x-250000=0
    20000*((1+x)^36-1)/x-250000=0
    20000*((1+x)^36-1)/x+50000*(1+x)^24+100000*(1+x)^12-900000=0
    SIN45
    20000*((1+x)^36-1)/x+50000*(1+x)^24+100000*(1+x)^12-90=0
    20000*((1+x)^36-1)/x+50000*((1+x)^24-1)/x+100000*((1+x)^12-1)/x-90=0
    (34-x)(20+5x)

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