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30=12+9p
We move all terms to the left:
30-(12+9p)=0
We add all the numbers together, and all the variables
-(9p+12)+30=0
We get rid of parentheses
-9p-12+30=0
We add all the numbers together, and all the variables
-9p+18=0
We move all terms containing p to the left, all other terms to the right
-9p=-18
p=-18/-9
p=+2
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