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21-10p=5p-4
We move all terms to the left:
21-10p-(5p-4)=0
We get rid of parentheses
-10p-5p+4+21=0
We add all the numbers together, and all the variables
-15p+25=0
We move all terms containing p to the left, all other terms to the right
-15p=-25
p=-25/-15
p=1+2/3
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