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(-3) + ( – 2) = -5
8 – 3 = 5
(+5) + (+4) = +9
(- 5) + (- 4) = - 9
(+20) + (-10) = 20 -10 = +10
(- 8) + (+3) = - 8 + 3 = - 5
(+11) + (- 2) = 11 - 2 = + 9
3 + 4 + 8 = 15
3 + (-4) + 5 + (-7)