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-34=-21+p
We move all terms to the left:
-34-(-21+p)=0
We add all the numbers together, and all the variables
-(p-21)-34=0
We get rid of parentheses
-p+21-34=0
We add all the numbers together, and all the variables
-1p-13=0
We move all terms containing p to the left, all other terms to the right
-p=13
p=13/-1
p=-13
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