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rezolvati in multimea numerelor intregi ecuatiile 7(3x-4)+19=3(5x-7)

Răspuns :

21x-28+19=15x-21
21x-15x=-21+28-19
6x=7-19
6x=-12/:6
x=-2
21x-28+19=15x-21
6x=-12
x=-2