(130.24+9.8h)h*[12-(195.36+9.8h)/(130.24+9.8h)]=1982.7
    (x+3)/x=7
    x/(x+3)=7
    130/(a+0.45)=40/a
    x/(x-1)+2x/(x^2-1)=1/(x+1)+1
    1/(x-1)+1=3/(2x-2)
    1/x=5/(x+3)
    0.37x+x=430
    sqrt(4x-3)-sqrt(3x-2)=sqrt(3x-1)-sqrt(2x-1)
    sqrt(4x-3)-sqrt(3x-1)=sqrt(3x-2)-sqrt(2x-1)
    (xsin55)^2+(60-xcos55)^2＝(74-x)^2
    -0.34k+0.36-1.72=0
    10000/x+20000/(x+66)=150
    19+1=3X+X
    20+X=3X
    19-X+1=3X
    X+X/0.952*0.048=120580.51
    X+X/0.952*0.048=12058.51
    X+X*0.952*0.048=12058.51
    x^5-(6+5)*x^4+(7*6+1)*x^3-(15*6-17)*x^2+(10*6-8)*x-2*6=0

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