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1.b) -540 + (-324) = -540 - 324 = -864
1.c) -366 + (-485) = -366 - 485 = -851
1.d) -3592 + 3584 + 3522 = 8 + 3522 = 3530
1.e) 6823 + (-6283) + 6328 = 6823 - 6283 + 6328 = 540 + 6328 = 6868
2.a) a + 1 = 0
a = 0 - 1
a = -1
2.b) a + 5 = 0
a = 0 - 5
a = -5
2.c) a + (-2) = 0
a - 2 = 0
a = 0 + 2
a = 2
2.d) a + (-10) = 0
a - 10 = 0
a = 0 + 10
a = 10
2.e) 4 + a = 0
a = 0 - 4
a = -4