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-138=-8p+6
We move all terms to the left:
-138-(-8p+6)=0
We get rid of parentheses
8p-6-138=0
We add all the numbers together, and all the variables
8p-144=0
We move all terms containing p to the left, all other terms to the right
8p=144
p=144/8
p=18
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