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5=(7p-3-4)/(8-12+3p)
5=7p-7/3p-4
5(3p-4)=7p-7
15p-20=7p-7
8p=13
p=13/8
c) 1/2=(7p-3-3p)/(8-5+6p)
1/2=(4p-3)/(3+6p)
3+6p=2(4p-3)
3+6p=8p-6
9=2p
P=9/2