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290=110+20p
We move all terms to the left:
290-(110+20p)=0
We add all the numbers together, and all the variables
-(20p+110)+290=0
We get rid of parentheses
-20p-110+290=0
We add all the numbers together, and all the variables
-20p+180=0
We move all terms containing p to the left, all other terms to the right
-20p=-180
p=-180/-20
p=+9
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