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90=6p+3p
We move all terms to the left:
90-(6p+3p)=0
We add all the numbers together, and all the variables
-(+9p)+90=0
We get rid of parentheses
-9p+90=0
We move all terms containing p to the left, all other terms to the right
-9p=-90
p=-90/-9
p=+10
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