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7p=10p-9
We move all terms to the left:
7p-(10p-9)=0
We get rid of parentheses
7p-10p+9=0
We add all the numbers together, and all the variables
-3p+9=0
We move all terms containing p to the left, all other terms to the right
-3p=-9
p=-9/-3
p=+3
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