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1050=21(p+20)
We move all terms to the left:
1050-(21(p+20))=0
We calculate terms in parentheses: -(21(p+20)), so:We get rid of parentheses
21(p+20)
We multiply parentheses
21p+420
Back to the equation:
-(21p+420)
-21p-420+1050=0
We add all the numbers together, and all the variables
-21p+630=0
We move all terms containing p to the left, all other terms to the right
-21p=-630
p=-630/-21
p=+30
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