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rezovati in multimea Z ecuatiile a) 17+X=1 b) X+39=0 c) -X-7= 0​

Răspuns :

a) 17+x = 1

x = 1- 17

x = - 16

b) x+ 39 =0

x = 0-39

x = - 39

c) x -7 =0

x = 0+ 7

x = 7