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p=7p-78
We move all terms to the left:
p-(7p-78)=0
We get rid of parentheses
p-7p+78=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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