x+x÷11.3=30
    X+x÷11.3=30
    3^2x=75
    3^2x=75
    【-4/（x-2）^2】-1/x=0
    x+(0.15x)=2559
    (x+5)/3-(3x-2)/2=-2
    4(y+4)=3-5(7-2y)
    (x+5)/3-(3x-2)/2=-2
    (n+2)/2=3n-1
    n+2/2=3n-1
    x+5/3-3x-2/2=-2
    2＾x-3x=1
    0.9*0.1*500*10^12=6.42*10^23*x^4*(1-(1/1+12.7*x^(-3/4)*3^(-1/2))*6.4*11.24*3.14*10^-2+2*3.14*4*10^-2+(1-0.1)*4*3.14*(1.1/2)^2*10^-2)
    xtan(x)=2.5
    arctan0.5w+arctanw+arctan0.1w = π
    arctanw+arctan0.5w+arctan0.1w=180
    arctanw+arctan0.5w+arctan0.1w=π
    -5X=-19
    cos1/x

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