Пожалуйста, помогите решить уравнения: 2/5z + 2/3z - 7/15z = 2 1/2
3 1/2 * (2/3x + 4/7) = 2 1/3
(5/8x - 1/5) * 3/4 = 3/4
3/5z + 2/3 z - 3 = 4/5
3 1/2 * (2/3x + 4/7) = 2 1/3
(5/8x - 1/5) * 3/4 = 3/4
3/5z + 2/3 z - 3 = 4/5
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