7) 3 + 8(n + 7) = 91

Explanation:

Step1: Expand the expression

$3 + 8n+56 = 91$

Step2: Combine like - terms

$8n + 59=91$

Step3: Isolate the term with n

$8n=91 - 59$ $8n = 32$

Step4: Solve for n

$n=\frac{32}{8}$

Answer:

$n = 4$