i forgot how to math please help

[vh]

f = a(f*k+w*l), w = b(f*k+w*l)

besides f and w, all the others are constants. solve for f

[vh]

i've got it. f(1-afk) = awl, do the same for w. now we have f in terms of w and w in terms of f. substitute.

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[vh]

ae = ad + de
cd = ce + de
if ae = cd then ad + de = ce + de
therefore ad + ce

am = cm therefore amc is isoceles w/ mac = mca
since angle mac = mca, side ad = side ec, angle bda = angle fec
therefore triangle abd is congruent to triangle efc (shit i screwed up vertex order)
and therefore ab = fc

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[Darvince]

what the christ