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4=-9p+-100
We move all terms to the left:
4-(-9p+-100)=0
We add all the numbers together, and all the variables
-(-9p-100)+4=0
We get rid of parentheses
9p+100+4=0
We add all the numbers together, and all the variables
9p+104=0
We move all terms containing p to the left, all other terms to the right
9p=-104
p=-104/9
p=-11+5/9
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