Hey there!
p + 99 = 107
SUBTRACT 99 to BOTH SIDES
p + 99 - 99 = 107 - 99
CANCEL out: 99 - 99 because it gives you 1
KEEP: 107 - 99 because it gives you the p-value
NEW EQUATION: p = 107 - 99
SIMPLIFY IT!
p = 8
Therefore, your answer is: p = 8
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)