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5p=7-4p=-21
We move all terms to the left:
5p-(7-4p)=0
We add all the numbers together, and all the variables
5p-(-4p+7)=0
We get rid of parentheses
5p+4p-7=0
We add all the numbers together, and all the variables
9p-7=0
We move all terms containing p to the left, all other terms to the right
9p=7
p=7/9
p=7/9
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