Answer:
p=5
Explanation:
3 + 2(p+4)=21
Subtract 3 from each side
3-3 + 2(p+4)=21-3
2(p+4)=18
Divide by 2
2/2(p+4)=18/2
p+4 = 9
Subtract 4 from each side
p+4-4 = 9-4
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