6(140+p)=80+200+420+8p+100
840+6p=800+8p
840-800=8p-6p
40=2p
40:2=p
20=p
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6(140+p)=80+200+420+8p+100
840+6p=800+8p
840-800=8p-6p
40=2p
40:2=p
20=p