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-7(1+3p)=98
We move all terms to the left:
-7(1+3p)-(98)=0
We add all the numbers together, and all the variables
-7(3p+1)-98=0
We multiply parentheses
-21p-7-98=0
We add all the numbers together, and all the variables
-21p-105=0
We move all terms containing p to the left, all other terms to the right
-21p=105
p=105/-21
p=-5
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