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43+8p=p+21
We move all terms to the left:
43+8p-(p+21)=0
We get rid of parentheses
8p-p-21+43=0
We add all the numbers together, and all the variables
7p+22=0
We move all terms containing p to the left, all other terms to the right
7p=-22
p=-22/7
p=-3+1/7
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