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10p-20=21p+13
We move all terms to the left:
10p-20-(21p+13)=0
We get rid of parentheses
10p-21p-13-20=0
We add all the numbers together, and all the variables
-11p-33=0
We move all terms containing p to the left, all other terms to the right
-11p=33
p=33/-11
p=-3
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