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rezolvati in multimea nr naturale ecuatia 3×{10+2 ×[ 40 - 2 ×(28 -3×5 )]} -7x = 51

Răspuns :

3x{10+2x[40-2x(28-3x5)]}-7x=51/:3
10+2x(40-2x13)-7x=17
10+2x14-7x=17
38-7x=17
7x=21
x=3
sper ca ti-am ajutat