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21p-8p+8p-8p-11p+5=39
We move all terms to the left:
21p-8p+8p-8p-11p+5-(39)=0
We add all the numbers together, and all the variables
2p-34=0
We move all terms containing p to the left, all other terms to the right
2p=34
p=34/2
p=17
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