469. Решите уравнения: 1) 3 • 15 - x1 = 21; 2) х - 4 - 6 = 18; . - 3) 2. 4x - 91 - 5 = 1; 4) 7. 2x - 3) - 23 = 12. ПОЖАЛУЙСТА ПОМОГИТЕ​
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