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what i have done which i guess is wrong is.

L*5400 - Lsin(32)Ft + 1/2Lsin(48)(3800)=0

and then i got rid of the L's

and got 5400 - sin(32)Ft + 1/2sin(48)3800=0

but this was wrong, if you could just explain to me how to do this it would really help a lot thanks.