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Rezolvati in Z ecuatiile:

a) 2x+12=x+4
b) 2x+23=x-9
c)3x-4=x+11


Răspuns :

a) 2x-x= - 12+4
x=-8

b) 2x-x= - 23-9
x=-42

c) 3x-x=11+4
2x=15
x=15 supra 2