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Rezolvati Ecuatiile: a) 5 ∙ (4x + 3) + 7 = 3 ∙ (x + 2) – 1 b) {1–[4–(x–2):( –3)]:(-5)}:( –2) = –1 c) 9–{8–[5–(3x–4)–18]–20} = 0