Question

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Answer 1

a) -1 + x = 4

x = 4 + 1

x = 5

b) -1 + x = -4

x = -4 + 1

x = -3

c). 6 + x = 15

x = 15 - 6

x = 9

d) 10 + x = 9

x = 9 - 10

x = -1