$$-59 + 0 = -59$$
$$+4 - 21 = -17$$
$$(-77) ÷ (-11) = 7$$
$$(+82) - (-9) = 82 + 9 = 91$$
$$88 ÷ (+2) = 44$$
$$0 × (-94) = 0$$
$$-78 ÷ 1 = -78$$
$$(-89) + (+89) = -89 + 89 = 0$$
$$+14 × (-2) = -28$$
$$-73 - 6 = -79$$