Question

What would be value?? Pls, help me.

Answer 1

We know when Division sign is present powers are Subtracted
$5n + 1 \: + \: 7n + 1 \: - \: 5n - 7n$
$5n + 1 - n \: + 7n + 1 + n$
$5 \: to \: the \: power \: 1 \: and \: 7n + 2$