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84=12+6p
We move all terms to the left:
84-(12+6p)=0
We add all the numbers together, and all the variables
-(6p+12)+84=0
We get rid of parentheses
-6p-12+84=0
We add all the numbers together, and all the variables
-6p+72=0
We move all terms containing p to the left, all other terms to the right
-6p=-72
p=-72/-6
p=+12
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