$-7+i-\left( 7+i \right)$
When there is a $-$ in front of an expression in parentheses, change the sign of each term of the expression and remove the parentheses$-7+i-7-i$
Since two opposites add up to $0$, remove them from the expression$-7-7$
Calculate the difference$-14$
Write the complex number in absolute value bars$|-14|$
The absolute value of any number is always positive$14$