justify"> Рішення:
1) x (? + 1) = 2 = 2 (? + 1) -1 = 2 ( ? 2 +6 ? +2) = 2? 2 + 5? + 4
) 2x + 3z = 6 + ? = ( 6 + ? + 5x) * 3 -1 = (6 + ? + 5 (2? 2 + 5? + 4)) * 5 = (6 + ? + 3? 2 + 4 ? + 6) * 5 == (3? 2 + 5? + 5) * 5 = ? 2 + 4? + 4
) x + 2y + z = 2 = (2 + 6x + 6z) * 2 -1 = (2 + 6 (2? 2 + 5? + 4) + 6 ( ? 2 + 4? + 4)) * 4 = (2 + 5? 2 + 2? + 3 + + 6? 2 + 3? + 3) * 4 = (4? 2 + 5? + 1) * 4 = 2? 2
