Adding and Subtracting Integers

Substitution into formuale can result in more complicated examples of addition and subtraction involving signed integers.

Can you answer these questions?

$5+(-2)=$
$6-(+3)=$
$9-(-1)=$
$-5-(+5)=$
$-2-(-7)=$
$-10+(+5)=$
$-12-(-8)=$
$-17+(-15)=$