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3+(-p)=-4
We move all terms to the left:
3+(-p)-(-4)=0
We add all the numbers together, and all the variables
(-1p)+3-(-4)=0
We add all the numbers together, and all the variables
(-1p)+7=0
We get rid of parentheses
-1p+7=0
We move all terms containing p to the left, all other terms to the right
-p=-7
p=-7/-1
p=+7
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