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87=9+6p
We move all terms to the left:
87-(9+6p)=0
We add all the numbers together, and all the variables
-(6p+9)+87=0
We get rid of parentheses
-6p-9+87=0
We add all the numbers together, and all the variables
-6p+78=0
We move all terms containing p to the left, all other terms to the right
-6p=-78
p=-78/-6
p=+13
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