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    (n+2754 -1)× 4=(n-396 -1)× 5
    x-985.20tan(6.28*5/x)
    5245x^(2)+26225x-7152=0
    14.3×300×374.8×(465−0.5×374.8)+360×804×430
    90x^3+258x^2+186x=42
    -13x^3+72x^2+52x-96=0
    3(x—2)=2x-5
    (100+x)(1000-2x)=115200
    (3-4x)/180+x/34+(x-30)/60=3
    x^3-6*x^2+5x+4=0
    (100+x)(1000-2x)=15200
    (100+x)(1000-2x)=100*1000*0.152
    e^(300x)+49e^(-50x)-50=0
    10A+11
    e(300x)+49e(-50x)-50=0
    7A+2
    1A+7
    (100+x)(1000-2x)=1.152
    4A+1
    0=471900x-2145x^2+360*430*804

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