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5*7=p-1
We move all terms to the left:
5*7-(p-1)=0
We add all the numbers together, and all the variables
-(p-1)+35=0
We get rid of parentheses
-p+1+35=0
We add all the numbers together, and all the variables
-1p+36=0
We move all terms containing p to the left, all other terms to the right
-p=-36
p=-36/-1
p=+36
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