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210=21+p
We move all terms to the left:
210-(21+p)=0
We add all the numbers together, and all the variables
-(p+21)+210=0
We get rid of parentheses
-p-21+210=0
We add all the numbers together, and all the variables
-1p+189=0
We move all terms containing p to the left, all other terms to the right
-p=-189
p=-189/-1
p=+189
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