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87=13+p
We move all terms to the left:
87-(13+p)=0
We add all the numbers together, and all the variables
-(p+13)+87=0
We get rid of parentheses
-p-13+87=0
We add all the numbers together, and all the variables
-1p+74=0
We move all terms containing p to the left, all other terms to the right
-p=-74
p=-74/-1
p=+74
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