Mathematics
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    20%x+20=25%x-20
    (2-a)/3-(1-a)/2=0
    3(x-7)-2(1-X)=22
    arctan(w*277.78*0.09)-90-arctan(w)-arctan(0.5*w)-arctan(w*277.78)=-180
    arctan(w*182.21*0.112)-90-arctan(w)-arctan(0.5*w)-arctan(w*182.21)=-180
    arctan(w*103.34*0.112)-90-arctan(w)-arctan(0.5*w)-arctan(w*103.34)=-180
    √((25)÷(0.49^2+1)÷0.49^2÷(0.25*0.491760^2+1))=1/a
    n^4-16*n^3+4*n^2-8*n=0
    1+x^2=x^4+4x^2+4x^3
    18.2 = 10*t^2 + 12.2t
    a^6-7*a+6=0
    lg√(25÷(0.491760^2+1)÷0.491760^2÷(0.25*0.491760^2+1))=lg(1/a)
    -90-arctan(w)-arctan(0.5*w)=-130
    24=5*x^2 +8*x
    x^2-200x-5000
    lg√(25÷(0.56^2+1)÷0.56^2÷(0.25*0.56^2+1))=lg(1/a)
    lg√(25÷(0.56^2+1)÷0.56^2÷(0.25*0.56^2+1))=lg1÷a
    √(25÷(0.56^2+1)÷0.56^2÷(0.25*0.56^2+1))=1÷a
    arctan(0.133*153.46*w)-90-arctan(w)-arctan(0.5*w)-arctan(153.46*w)=-180
    √(25÷0.56^2÷(0.56^2+1)÷(0.25*0.56^2+1))=1/a

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