Find the sum using properties of integers :
(1) -3 + 5 + (-6) + (-7) + 5 + 6
(it) (-11) + (-14) + 19 + 4
(ii) 15 + (-7) + (-6) + 4 - (- 4) + 1
(iv) -275 + (- 40) - (-5) - (-160)
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