Answer
$p=5$
Work Step by Step
Given: $10+4p=3(5+p)$
$10+4p=3p+15$
$\implies 4p-3p=15-10$
$\implies p=5$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.