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    (124-6x)/4=21.25
    (10+x)(500-20x)=6000
    (10+x)×(500-0.2x)=6000
    X/70=x/60-1
    e^x-2×x
    X/70=x/60-1
    arctanw+arctan0.1w = 90
    arctanw+arctan0.1w = 180
    arctanw+arctan0.1w = 180
    arctanw+arctan0.1w = 180
    arctanw+arctan0.1w=180
    x^2-60*x+1000
    9^x=4x^4+4x^2+1
    3^x=2x^2+1
    4^(x+1)=x^6
    4^(x+1)=x^6
    2^(2x-1)=(x^3+9x^2+2x)/6
    a^2-12 a+2=0
    arctanx+arctan(x/2)=60
    arctanx+arctan(x/2)=60

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