$$-9 × 11 = -99$$
$$(-64) ÷ (-16) = 4$$
$$(+5) - (+38) = 5 - 38 = -33$$
$$-26 + 26 = 0$$
$$(+7) - (-27) = 7 + 27 = 34$$
$$(-81) × 0 = 0$$
$$-85 ÷ (+1) = -85$$
$$29 × (-3) = -87$$
$$+81 ÷ 3 = 27$$
$$0 + (-21) = -21$$