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30=21+1p
We move all terms to the left:
30-(21+1p)=0
We add all the numbers together, and all the variables
-(p+21)+30=0
We get rid of parentheses
-p-21+30=0
We add all the numbers together, and all the variables
-1p+9=0
We move all terms containing p to the left, all other terms to the right
-p=-9
p=-9/-1
p=+9
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