Four tangents

Given two circles with equations $(x+5)^2+(y+2)^2=16$ and $(x-3)^2+(y-4)^2=25$ , there are four tangents to them, at the same time.

If two of them are: $y=\dfrac{a \pm b\sqrt{c}}{d}x+\dfrac{e \pm f\sqrt{c}}{d}$ And the other two are: $y=\dfrac{g \pm h\sqrt{j}}{k}x+\dfrac{l \pm m\sqrt{j}}{k}$

Find $a+b+c+d+e+f+g+h+j+k+l+m$ , where the equations of the line are in its simplest form.