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-7=-8p+9p
We move all terms to the left:
-7-(-8p+9p)=0
We add all the numbers together, and all the variables
-(+p)-7=0
We get rid of parentheses
-p-7=0
We add all the numbers together, and all the variables
-1p-7=0
We move all terms containing p to the left, all other terms to the right
-p=7
p=7/-1
p=-7
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