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