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(25+15+10+p)/4=20
We move all terms to the left:
(25+15+10+p)/4-(20)=0
We add all the numbers together, and all the variables
(p+50)/4-20=0
We multiply all the terms by the denominator
(p+50)-20*4=0
We add all the numbers together, and all the variables
(p+50)-80=0
We get rid of parentheses
p+50-80=0
We add all the numbers together, and all the variables
p-30=0
We move all terms containing p to the left, all other terms to the right
p=30
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