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2604=21(p+40)
We move all terms to the left:
2604-(21(p+40))=0
We calculate terms in parentheses: -(21(p+40)), so:We get rid of parentheses
21(p+40)
We multiply parentheses
21p+840
Back to the equation:
-(21p+840)
-21p-840+2604=0
We add all the numbers together, and all the variables
-21p+1764=0
We move all terms containing p to the left, all other terms to the right
-21p=-1764
p=-1764/-21
p=+84
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