Решение уравнений

1. a) 18x + 23x = 697; 41x = 697; x = 697 / 41; x = 17
2. б) 72y – 25y = 611; 47y = 611; y = 611 / 47; y = 13
3. в) 59z – z = 348; 58z = 348; z = 348 / 58; z = 6
4. г) 103t – 5t = 1960; 98t = 1960; t = 1960 / 98; t = 20