Ответ:Корни −3 и −2: z ∈ (−∞; −3] ∪ [−2; +∞).Корни −1/5 и 1/7: x ∈ (−1/5; 1/7).Нули 2/15, 1/2 и 7: x ∈ (−∞; 2/15) ∪ (1/2; 7).